Complete List of Prohibited Marriages in the Orthodox Church

The following relationships are among those prohibited by the canonical tradition of the Orthodox Church from entering into marriage:
Blood Relationships
a. Ascending Relatives:
1. Parents.
2. Grandparents.
3. Great-Grandparents.
b. Descending Relatives:
1. Children.
2. Grandchildren.
3. Great-Grandchildren.
Marriages between Ascending and Descending Blood Relatives are prohibited.
Collateral Relatives
1. Brothers and Sisters.
2. Direct Uncles and Aunts.
3. Nephews and Nieces.
4. First Cousins.
5. Second Uncles and Aunts.
6. Second Nephews and Nieces.
7. Second Cousins.

All Collateral Blood Relatives are prohibited to marry up until the seventh degree, that is, up until the second cousin. Eighth degree and beyond are allowed, such as a male third cousin and a female third cousin, or a male second cousin with the granddaughter of his second cousin.
Relationships By Marriage
a. Marriages between two kindred by affinity in which the one kindred furnishes but one party lineally.
For example:
1. Father and Step-Daughter.
2. Mother and Step-Son.
3. Grandfather and Step-Granddaughter.
4. Grandmother and Step-Grandson.
5. Great-Grandfather and Step-Great-Granddaughter.
6. Great-Grandmother and Step-Great-Grandson.
7. Great-Great-Grandfather and Step-Great-Great-Granddaughter.
8. Great-Great-Grandmother and Step-Great-Great-Grandson.
b. Marriages between two kindred by affinity in which the one kindred furnishes two parties lineally.
For example:
1. Father and Son with a Mother and Daughter.
2. Father and Son with a Grandmother and Granddaughter.
3. Father and Son with a Great-Grandmother and Great-Granddaughter.
4. Father and Son with a Great-Great-Grandmother and Great-Great-Granddaughter.
5. Father and Son with Two Sisters.
6. Father and Son with a First-Aunt and Niece.
7. Father and Son with a Great-Aunt and Niece.
8. Father and Son with Two First Cousins.
9. Father and Son with Two Second Cousins.
The same above applies with Mothers and Daughters, Fathers and Daughters, Mothers and Sons marrying those mentioned. The same goes for Grandparents and Great-Grandparents. There must be six degrees of separation. 
c. Marriages between two kindred by amity in which the one kindred furnishes but one party laterally.
For example:
1. A Man and his Wife’s Sister after her death.
2. A Man and his Wife’s First-Aunt and Niece after her death.
3. A Man and his Wife’s Grand-Aunt and Niece after her death.
4. A Man and his Wife’s First Cousin after her death.
5. A Man and his Wife’s Second-Aunt and Niece after her death.
6. A Man and his Wife’s Grand-Aunt and her Niece’s Daughter after her death.
7. A Man and his Wife’s Second Cousin after her death.
8. A Man and his Wife’s Granddaughter of her Cousin after her death.
The same applies with a woman and the relatives of her husband after his death. There must be six degrees of separation.
d. Marriages between two kindred by affinity in which one kindred furnishes two parties collaterally.
For example:
1. Two Brothers and Two Sisters
2. Two Brothers with a Proximate Aunt and Niece
3. Two brothers and Two First Cousins
4. Two Brothers with a Grand-Aunt and Niece
5. Two Brothers with a Second Aunt and Niece
6. Uncle and Nephew with a Mother and Daughter
7. Two Proximate Uncles with Two Proximate Nieces
8. Two Proximate Nephews with Two Proximate Aunts
9. Two First Cousins with a Great Grandmother and Great Granddaughter
10. A Man may not marry the wife of his Father or Grandfather if they have more than one wife.
11. A Man with his Mother-In-Law
12. A Man with the Wife of his Brother after he died.
13. A Man with the Wife of his Uncle after he died.
14. A Man with the Daughter of his Mother-In-Law by another man.
15. A Man with the Sister-In-Law of his Son, or of his Grandson, or of his Great-Grandson.
16. A Man with his own stepdaughter, i.e. a daughter, or a granddaughter, or a great-granddaughter of the wife whom he has divorced and who had them by another man either before he took her to wife, or after he married her. There must be six degrees of separation.
Relationships Involving Three Lineages
For example:
1. A Step-Father with the Wife of his Step-Son after he died.
2. A Step-Mother with the Husband of her Step-Daughter after she died.
3. One and the same Man may not marry the Sister and the Stepdaughter of his Wife’s Brother.
4. One and the same man may not marry a proximate niece and the wife of her proximate uncle.
5. A Step-Father may not marry the Step-Daughter of his own Step-Daughter.
6. A Wife’s Brother may not marry the woman who was a Second Wife of the Husband of his Sister, that is to say, of his Brother-In-Law, after the death of his Sister.
7. A Father and his Son may not marry a Husband’s Sister and a Sister-In-Law.
8. Two Brothers may not marry a Step-Mother and a Step-Daughter.
9. Two Brothers may not marry a Mother-In-Law and a Sister-In-Law.
All marriages that exceed the third degree, and are of the fourth, or of the fifth, or of the sixth degree, and so on, in respect thereof are allowable.
Relationships Due To Holy Baptism

St. Nikodemos the Hagiorite:

“This relationship results when one sponsors a child at the ceremony of Holy Baptism. For the man who undertakes this sponsorship is making the child in question his spiritual son or daughter, as the case may be; accordingly, he in fact becomes a closer and more intimate relative and father of the child than is its carnal father, because just as much as the spirit is higher than the body the relationship of the spirit is higher than that of the flesh.”
For example:
1. A Godfather (or his Carnal Son) may not marry his Goddaughter, i.e., any girl that he has baptized.
2. A Godfather (or his carnal Son) may not marry the Mother or Daughter of his Godchild.
3. None of the Godfather’s Children may marry the Mother of their Father’s Godchild.
4. Nor may any Child marry a Daughter of his Father’s Goddaughter.
5. If perchance Two Children, one male and the other female, happen to be baptized by one and the same Godfather, they may not marry each other.
6. A Man may not marry the Widow of his Spiritual Brother.
7. If the Husband baptizes One Child, and his Wife another, these Children may not intermarry.
8. A Son-In-Law may not marry the Goddaughter of his Father-In-Law.
Relationships By Adoption
1. Adopting Parents with Adopted Children.
2. Adopted Brother with a Sister or Step-Sister from Adopting Parents.
3. Adopted Sister with a Brother or Step-Brother from Adopting Parents.
4. Adopted Child with a Relative of the Adopting Parents.
There must be four degrees of separation.
Marriage and Clergy
1. Deacons and Presbyters may marry before ordination, but if their spouse dies or if there is a divorce they are prohibited from any further marriage, unless they leave the priesthood.
2. Bishops are not to marry under any condition.
Remarriage is forbidden in the Orthodox Church, yet out of condescension to the weaknesses of humanity the Orthodox Church does allow remarriage under certain conditions.
If a layperson remarries under the lawful conditions of the Church, they are only allowed to be remarried up to two times beyond the first marriage. Fourth marriages are prohibited to all under any condition. 
Inter-Christian and Inter-Religious Marriages
Canonical and theological reasons preclude the Orthodox Church from performing the Sacrament of Marriage for couples where one partner is Orthodox and the other partner is a non-Christian. As such, Orthodox Christians choosing to enter such marriages fall out of good standing with the Church and are unable to actively participate in the life of the Church. While this stance may seem confusing and rigid, it is guided by the Orthodox Church’s love and concern for its member’s religious and spiritual well-being.
If one of the marriage partners (either the groom or the bride) is not an Orthodox Christian:
a. The non-Orthodox partner shall be a Christian who was Baptized with water in the name of the Holy Trinity in a denomination that expresses a belief in the Holy Trinity.
b. The non-Orthodox partner shall be willing to have any children issuing from the marriage Baptized in the Orthodox Church as well as raised and nurtured in accordance with the Orthodox faith.
c. The non-Orthodox partner shall not be a member of the following churches or religions (these marriages are prohibited in the Eastern Orthodox Church): (1) Assembly of God (2) Buddhism (i.e., a Buddhist) (3) Christian Scientist (4) Disciples of Christ (5) Members of any Far Eastern Religion (6) Hinduism (i.e., a Hindu) (7) Islam (i.e., Muslims) (8) Jehovah’s Witness (9) Judaism (i.e., a Jew) (10) Mennonite (11) Mormon (also called “Latter Day Saints) (12) Any Non-Christian (13) Pentecostal (14) Quaker (15) Salvation Army (16) Seventh Day Adventist (17) Spiritualist (18) Swedenborgian (19) Unitarian (20) Cults or New Age movements.
Adelphopoiesis or Adopted Brotherhood
St. Nikodemos the Hagiorite:
“Adoption imitates nature, but nature never generates a brother, but only a son. So adoption, as imitating nature, cannot make a brother. Hence such a thing as making a brother by adoption not only is not practicable or to be considered to constitute an obstacle to marriage among themselves of such allegedly adopted brothers, but neither ought it to be projected at all. For it ought to be rejected from the Church of Christ, on the ground that it is the cause of many evils and of the perdition of souls to most of them, and merely affords matter for some persons to fulfill their carnal desires and to enjoy sensual pleasures, as countless examples of actual experience have shown at various times and in various places.” 
St. Nikodemos warns here of the dangers of Adopted or Blood Brotherhood rituals turning into homosexual relationships. This applies to any form of homosexual relationship from becoming a marriage as well, since a homosexual marriage (between two men or two women) was unthinkable to the Fathers of the Church who composed the canonical prohibitions of marriage.
Betrothal, or Engagement
This refers to an engaged couple who have been formally Betrothed in a church by a priest. Today betrothals tend to be informal until the wedding day, when a Betrothal ceremony is combined with the Wedding Service. 
Laymen are forbidden to marry a cousin or any other person related to their fiancée after she has died while they were engaged.
Monastics are forbidden to marry under any circumstance.
Bigamy and Polygamy
Bigamy and Polygamy are forbidden in the Orthodox Church.
Final Note
The Canons are guides in the pastoral ministry of the Church for the spiritual maturation of the faithful, to help the members of the Church be healed of their weaknesses and passions and elevate them spiritually through her sanctifying grace. It is in this light that the above marital prohibitions should be viewed. There may be some minor differences among the various Orthodox jurisdictions in how they are applied, and sometimes even how Bishops may choose to apply them. For example, certain jurisdictions may not allow intermarriage with certain non-Orthodox Christians that another jurisdiction may allow, and vice versa. Sometimes, in extreme and unique situations, these canonical prohibitions can be allowed by economia, or leniency, as has been the case historically. For example, in isolated villages the prohibitions on relatives marrying have been slightly reduced a bit, since most in the surrounding villages were related in one way or another. Or one can even cite how after World War I, certain Serbian clergy were allowed to remarry since many of their spouses had died or were killed prematurely, and they were forced to raise their children alone, which caused a disturbance in that area. In certain cases, especially under Ottoman occupation, Orthodox women were forced to marry Muslim men, and the Church allowed this by necessity and kept them in good standing with the Church. Even divorce and remarriage, which is not allowed in the Orthodox Church, is allowed in certain circumstances, depending on jurisdiction. Therefore, if there are any questions regarding the above Canons and prohibitions, refer to your local Priest, who can refer to his Bishop. Any deviation, however, can only be blessed by the local Bishop, yet deviation is highly discouraged, as St. Nikodemos informs us above.


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  1. Not one of these forbidden marriages is a so-called "inter-racial" marriage. That is there nothing forbidding people of different skin colour from marrying. Someone of European ancestry and white skin can canonically marry someone of African ancestry and black skin. Not one word of so-called "miscegenation".

    1. I am confused – are you saying that miscegenation should be included in this list or that you are relieved to see it is not here?

    2. The Inter-racial marriage does not exist in Eastern Europe. We are all Whites.

      God created us differents : Whites, Blacks, Asians…
      If God cared to make a difference between the human races throughout our different Racial DNA , let’s stay different and keep God’s Will !!!
      It means that the Whites inter-marry exclusivement only with Whites, the Blacks with Blacks only , etc…
      Keep and preserve God’s creation and do not mix up your DNA with another DNA because that is ethnocide of the both sides !

      1. St Paul states in his letters to the Galatians there is neither Jew nor Greek in Christ Jesus. Not only that, but there are people who don’t consider eastern Europeans to be “white”. We are united by Christ, not by our skin color and features. Blessings and peace

  2. But in Bible there are not any husbands who was older than their wife …why is that ….even when GOD gives Adam his wife (Hewan )she was 15 years younger than him ….why GOD made her to be 15 years younger than her husband ……In Bible everything has its own reason …don’t you think?

    1. Dear Antony! There is no specific indication in the Bible that the husband should be older than the wife, or that Adam was older than Eve. The specific age of all the married couples mentioned is not indicated there either. If you love a girl older than you, and God blesses your marriage through a priest, then marry her with peace of mind, rather than inventing your own theories.

  3. The strict application of these rules within a pluralistic society is probably the main reason why active membership in the Orthodox Church in the United States, in all its jurisdictions, has steadily declined for decades.

  4. Are arranged marriages still practiced today by Orthodox Christians who live in traditional cultures around the world? Does it happen here in USA amongst immigrant Orthodox? The modern dating is a cesspool for Orthodox Americans to navigate. The Churches are mostly older married people. If one is a seriously practicing young Orthodox it seems monkhood and nunhood are more likely options than finding a young serious Orthodox spouse willing to marry within a year of meeting. Orthodox dating apps and websites are full of non-practicing Orthodox who want to date in a similar way the secular world dates.

    1. Oh my goodness I really wish it were. Seriously.
      But, it is a practice I suppose to press on in total Faith. If God Wills for me a husband, I can not deny He will send him in His own time for me.
      But. I am 33. Much easier said than done along the way. I am certainly considering monastic path, but this also must be a decision from heart and ultimately led by God.

  5. Are step siblings allowed to marry? They didn’t grow up together, also we are in a Serbian church.

    1. Dear Lydia, you should ask this question to ruling bishop or your spiritual father or the priest you trust.

    1. Hello, Amir! I’m quite sure that it is allowed for muslims (in Islam), as well as it is allowed by civil law, but it is not allowed in Orthodoxy.
      Church wedding in this case is not possible and this kind of marriage won’t be recognized by the Church: “An orthodox man is not permitted to marry an heretical woman, nor an orthodox woman to be joined to an heretical man. But if anything of this kind appear to have been done by any [we require them] to consider the marriage null, and that the marriage be dissolved…” (Canon 72, 6th Ecumenical Council)

  6. With such a detailed list, I am surprised that it is also not mentioned that 2 women are not allowed to marry, nor are two men. There are not just a few in the church who wish to revise this. And I am not convinced that these unions are not blessed in some fashion by some of our Orthodox Clergy. This is undoubtedly an entire discussion in itself, but I’m surprised it wasnt listed here.

    1. If you plan to marry in the Orthodox church, then you will have to openly declare that you’re willing to upbring your kids in the Orthodox faith. I guess there are no more requirements.

    1. I suppose it would be for a bishop to decide. If you are not in a civil marriage, then I guess it may happen. But I’m not sure. Contact your parish priest or diocesan bishop.

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