Oklahoma Annulment Laws: Grounds, Residency and How to File (2026)

Oklahoma's district courts can annul a marriage, and Title 43 of the Oklahoma Statutes sets out statutory grounds in three places. Kinship marriages are "incestuous, illegal and void" under 43 O.S. 2; a marriage by a party incapable "from want of age or understanding" may be declared void under 43 O.S. 128; and remarrying within six months of a divorce is a ground for annulment under 43 O.S. 126.

Information last verified on 2026-10-08. This article has not been reviewed by a licensed lawyer.

Jurisdiction scope: This article covers civil annulment under Oklahoma Statutes Title 43, mainly 43 O.S. 2, 3, 102, 103, 105, 110, 126 and 128. Apart from two Oklahoma Supreme Court decisions (Whitney v. Whitney, 1942, and Blunt v. Blunt, 1947), it does not cover Oklahoma case law on annulment. It also does not cover property division or alimony after an annulment, name changes, inheritance, court forms, or other states' law. For ending a valid marriage, see Oklahoma divorce laws.

Can you get an annulment in Oklahoma?

Yes. Oklahoma's statutes treat annulment as one of three family-law proceedings, alongside dissolution of marriage and legal separation. Under 43 O.S. 105(A), "A proceeding for dissolution of marriage, an annulment of a marriage, or a legal separation shall be titled 'In re the Marriage of _______ and ______'."

The statute that creates the main annulment action, 43 O.S. 128, uses the phrase "declared void by the district court." Separately, 43 O.S. 2 declares certain kinship marriages void outright.

Void marriages: close relatives

43 O.S. 2 declares marriages between these relatives "incestuous, illegal and void":

• ancestors and descendants of any degree;
• a stepfather and stepdaughter, or a stepmother and stepson;
• an uncle and niece, or an aunt and nephew, except where the relationship is only by marriage;
• brothers and sisters of the half or whole blood;
• first cousins.

The same section makes an exception for first cousins who married elsewhere: "any marriage of first cousins performed in another state authorizing such marriages, which is otherwise legal, is hereby recognized as valid and binding in this state as of the date of such marriage."

The licensing statute reinforces the rule. Under 43 O.S. 3(C) (renumbered 3(B) from November 1, 2026, with "title" in place of "chapter"), "No marriage may be authorized when such marriage would be incestuous under this chapter."

Want of age or understanding (43 O.S. 128)

43 O.S. 128 is the section that sets out an annulment action, who may bring it and what defeats it:

"When either of the parties to a marriage shall be incapable, from want of age or understanding, of contracting such marriage, the same may be declared void by the district court, in an action brought by the incapable party or by the parent or guardian of such party; but the children of such marriage begotten before the same is annulled, shall be legitimate."

Section 128 sets no fixed filing period. Instead, it provides a defense: "Cohabitation after such incapacity ceases, shall be a sufficient defense to any such action." A person who keeps living with the other spouse after reaching the age of capacity, or after regaining understanding, can therefore lose the claim.

Oklahoma courts handle annulment as an equitable action. In Blunt v. Blunt (1947), decided under the predecessor of section 128, the Oklahoma Supreme Court held that parents who learned of their son's marriage and acquiesced in it, instead of acting promptly, could not maintain the annulment action.

Remarriage within six months of a divorce (43 O.S. 126)

A third ground concerns timing after a divorce. 43 O.S. 126 provides: "A marriage wherein one of the parties had not been divorced for six (6) months shall hereafter in this state be ground for annullment of marriage by either party."

Section 126 does not state a filing deadline or a defense. Related sections, 43 O.S. 123 and 127, deal with marrying within six months after an Oklahoma divorce decree; section 123 treats it as a criminal matter. This page does not cover how Oklahoma courts currently apply section 126.

Grounds at a glance

"None stated" means the cited section does not set one. It does not mean no other rule applies; ask an Oklahoma lawyer about a specific case.

Other grounds: bigamy, fraud and force

The annulment sections covered here, 43 O.S. 126 and 128, do not list fraud, force or a prior undissolved marriage. 43 O.S. 123 and 124 treat marrying within six months of an Oklahoma divorce decree as the crime of bigamy. The Oklahoma Supreme Court has held that a marriage by a man who already had an undissolved marriage was "bigamous and void," relying on Article 1, Section 2 of the Oklahoma Constitution, which says "Polygamous or plural marriages are forever prohibited" (Whitney v. Whitney, 1942). A related section, 43 O.S. 125, validates earlier court decrees that annulled marriages because a prior divorce decree "had not become final."

Impotency and a fraudulent contract appear in 43 O.S. 101 as grounds for divorce. This page does not cover whether Oklahoma courts annul marriages on other grounds beyond those described here; a lawyer licensed in Oklahoma can advise on a specific situation.

Underage marriage rules in Oklahoma

The want-of-age ground depends on the marriage-age statute, 43 O.S. 3, which changes on November 1, 2026.

Until October 31, 2026. Section 3 sets 18 as the general marriage age and provides routes for people under 18 to marry with the consent of a parent or guardian, or with the court's permission.

For people under 16, 43 O.S. 3(B)(2) provides: "Every person under the age of sixteen (16) years is expressly forbidden and prohibited from entering into the marriage relation except when authorized by the court: a. in settlement of a suit for seduction or paternity, or b. if the unmarried female is pregnant, or has given birth to an illegitimate child..."

From November 1, 2026. Laws 2026, SB 504, c. 349 rewrites section 3 effective November 1, 2026. From that date only an unmarried person "who is at least eighteen (18) years of age and not otherwise disqualified" is capable of marrying, and the parent-consent and court-authorization exceptions are removed. This page does not cover how the change applies to a marriage entered before November 1, 2026.

How to file for an annulment in Oklahoma

Residency. 43 O.S. 102 applies the divorce residency rule to annulment: "the petitioner or the respondent in an action for divorce or annulment of a marriage must have been an actual resident, in good faith, of the state, for six (6) months immediately preceding the filing of the petition." Residents of a military reservation in Oklahoma may sue or be sued on the same six-month basis.

County. Under 43 O.S. 103(A)(1), "An action for divorce or annulment of a marriage may be filed in the county in which the petitioner has been a resident for the thirty (30) days immediately preceding the filing of the petition or in the county in which the respondent is a resident." The chief judge may assign the trial to another county in the judicial district.

Automatic injunction. Under 43 O.S. 110(A)(1), once a petition for annulment is filed and personally served with the summons on the respondent, "an automatic temporary injunction shall be in effect against both parties." Section 110 also provides for temporary orders while the case is pending.

Forms. This page does not list court forms. Ask the court clerk in the county where you plan to file what the court requires.

Children after an annulment

For a marriage annulled for want of age or understanding, 43 O.S. 128 provides that "the children of such marriage begotten before the same is annulled, shall be legitimate."

Custody is decided under the best-interests standard in 43 O.S. 109, and the temporary-order provisions of 43 O.S. 110 reach annulment cases. See Oklahoma child custody laws.

Property, alimony and name after an annulment

Oklahoma's main property and alimony statute, 43 O.S. 121, is worded for a granted "dissolution of marriage," and so is its provision restoring a former name. 43 O.S. 108 lets the court divide property and make orders for children where it grants alimony without a divorce or refuses a divorce.

This page does not cover whether or how a court divides property, awards alimony or restores a former name in an annulment, or whether a spouse who married in good faith has added protection. Ask an Oklahoma lawyer.

Annulment vs. divorce in Oklahoma

A divorce ends a valid marriage; under 43 O.S. 122, a divorce "shall operate as a dissolution of the marriage contract." An annulment rests on a defect such as close kinship or a party's want of age or understanding when the marriage was made. For divorce grounds and residency, see Oklahoma divorce laws.

A church annulment and a court annulment are separate processes.

Disclaimer: This article provides general legal information about civil annulment under Oklahoma law, Title 43 of the Oklahoma Statutes. It is not legal advice. The information was verified on 2026-10-08, and the law can change. For advice about a specific marriage, consult a lawyer licensed in Oklahoma or the district court clerk's office.

Related

• Annulment laws in every state
• Oklahoma divorce laws
• Oklahoma child custody laws
• Oklahoma common-law marriage
• Oklahoma marriage and divorce records

Last updated: 2026-10-08.

Frequently Asked Questions

What are the grounds for annulment in Oklahoma?

Title 43 declares kinship marriages void (43 O.S. 2), allows a marriage to be declared void when a party lacked capacity from want of age or understanding (43 O.S. 128), and makes remarriage within six months of a divorce a ground for annulment (43 O.S. 126). Court decisions also treat a marriage by an already-married person as void (Whitney v. Whitney, 1942); this page does not cover other court-recognized grounds.

How long do you have to live in Oklahoma to get an annulment?

The petitioner or the respondent must have been a good-faith Oklahoma resident for six months before filing (43 O.S. 102). The county rule in 43 O.S. 103 adds a 30-day county residence for the petitioner, or filing where the respondent lives.

Is there a time limit to annul a marriage in Oklahoma?

Sections 126 and 128 of Title 43 set no fixed filing period. Under 43 O.S. 128, cohabitation after the incapacity ends is a sufficient defense to an annulment for want of age or understanding. Oklahoma courts treat annulment as an equitable action: in Blunt v. Blunt (1947), parents who learned of their son's marriage and acquiesced instead of acting promptly could not maintain the action.

Can first cousins marry in Oklahoma?

No. 43 O.S. 2 declares first-cousin marriages incestuous, illegal and void, but recognizes a first-cousin marriage lawfully performed in another state that allows it.

Is a marriage within six months of divorce valid in Oklahoma?

Under 43 O.S. 126, a marriage in which one party had not been divorced for six months is a ground for annulment by either party.

Are children legitimate after an annulment in Oklahoma?

For a marriage annulled for want of age or understanding, 43 O.S. 128 provides that children begotten before the annulment are legitimate.