Marriage to a God

Not literal marriage to a Physical God, that is, but a symbolic marriage to a less-tangible deity, who may or may not be real. Sometimes it's fairly benign—the girl in question (and it usually is a girl) simply serves as a priestess of the deity to whom she is wedded. For more martial characters, it can be part of a Heroic Vow. Other times, this involves Human Sacrifice, in which case the god is probably either evil (possibly a demon or an Eldritch Abomination) or nonexistent. This type can be the dark secret of the Town with a Dark Secret and may be accompanied by a Fete Worse Than Death.

For the more literal type of marriage, see Divine Date.

Anime and Manga

 * The girl in the Mushishi, who travelled with the swamp. She was sacrified as a bride of river god, due to flood in her village.
 * In a way, the Priestess in Fushigi Yuugi becomes a consort to whatever god she summons. (Driven home, for example, by Seiryuu assuming human form and entering Yui's heart, causing her to orgasm.) This may be an explanation as to the fancy ceremonial robes (which, particularly with Miaka's do evoke images of some kind of bride), and why the Priestess is supposed to be a virgin.
 * In How NOT to Summon a Demon Lord, Lumachina is a high priestess of a faith that has this policy for female clergy. Unfortunately, she takes it way too literally: when Takuma (as Diablo) rescues her from an assassin while she is praying for help, she mistakes him for an avatar of her god, and believes she is obligated to literally be his wife. Yeah, it's that kind of anime, and to be frank, this is not the strangest way Takuma has met a woman who wants him to ravish her.

Comic Books

 * The Manhwa The Bride of the Water God begins with the heroine Soah being offered up as a sacrifice in symbolic marriage to the water god Habaek in order to end a severe drought. Then it turns out it's not all that symbolic and things get more complicated from there.
 * Adam Destine from ClanDestine has this going on. It's a djinn, rather than a god, but the thought counts.
 * Fred Christ, a transhumanist Con Man and Cult leader in Transmetropolitan, has "Brides of Christ," who are expected to get a lot more...frisky...with their deity than regular nuns do.
 * Traditionally, the Dora Milaje are this to the Black Panther; currently still a technicality, even though T'Challa - the current Black Panther - is no longer considered a God-Emperor and has an  actual wife.

Film

 * Referenced in Troy. Achilleus tells Berseis, who is a virgin priestess of Apollo that if she professes to love the gods, she'll find the romance one sided.
 * Of course, in traditional Greek Mythology, that's not exactly true.

Literature

 * In CS Lewis's Till We Have Faces, Istra's sacrifice appears to be this initially. Then it turns out she does get literally married to a Physical God.
 * In the Belgariad, Nyissians select a girl who looks especially like Salmissra, a priestess favored by their serpent deity. Said look-alike then rules as queen until death, regardless of qualifications or lack thereof.
 * This is because Issa forgot to give the original Salmissra immortality and, in typical Nyissan fashion, the Nyissans thought it easier to get themselves another queen rather than risk waking up and possibly annoying their god. 20 girls are initially selected for "training", and when one takes the throne, the remaining 19 are killed to prevent dissention. It's actually best if Salmissra lacks qualifications, as displaying any semblance of competence tends to lead to the grooming of their successors.
 * Happens to the Minoan girl in The Egyptian. But God Is Dead and it's a Crapsack World anyway, so things go badly.
 * Michael Gear/Kathleen O'Neal Gear's People of the Thunder ends when a Seer-woman dives into the river to marry the Horned Serpent (taking the Jerkass to end all Jerk Asses down with her)
 * In The Once and Future King, Elaine joins a convent after Lancelot abandons her. The narrator notes that there's nothing particularly romantic about her decision to become a "bride of Christ", and she just thought it was the only thing for her to do.

Live Action TV

 * In True Blood, Maryann is a maenad, and her plan is to
 * The Australian mini-series Brides of Christ shows the rituals of becoming a nun through the eyes of Diana and Veronica, from their postulancy to their novitiate and taking of the vows. Their's even a wedding, but all brides and no (visible) groom).
 * Used as an off-joke in Golden Girls, where Sophia claims that one benefit a nun gets from being married to God is "at least He's home every night".
 * Also used as an off-joke one Night Court episode. Harry dates a former nun and Dan sarcastically warns him that "her ex is a jealous type".

Tabletop Games

 * Dungeons and Dragons module Adventures in Blackmoor. Toska Rusa was selected by the Afridhi to become the mistress and high priestess of their god Zugzul the One.
 * Exalted features the Brides of Ahlat, an Amazon Brigade in the southern regions of Creation who are symbolically married to the local god of war.
 * Warhammer Fantasy has the dark elf Witch Elves, virgin women symbolically married to Khaine, the god of war and murder. Apparently "he is a jealous god, unwilling to share his chosen ones" and the Witch Elves are happy to stick sharp, pointy things in anyone who tries it on.

Video Games

 * In Raidou Kuzunoha VS King Abaddon, one character is "engaged" to Tento, the god worshipped by the Tsukigata family..
 * Something like this happens in Siren.
 * The Chant in Dragon Age Origins tells of Andraste, mortal woman who the Maker fell in love with, and became His prophet. She then led a crusade against The Empire, was betrayed by her mundane husband and burned at the stake.

Western Animation

 * In The Oblongs, two nuns get into a cat fight when one of them declares that she's a bride of Christ, and the other one adamantly claims that she's the bride of Christ.
 * In an episode of The Angry Beavers, Norb and Dag are watching a late-night B-Movie about Viking Women from Venus, who drink radioactive lava from a volcano, in a competition to become the Bride of the Volcano.

Real Life

 * During imperial China, in some villages, girls used to be periodically thrown in the river (or other local water bodies) as 'brides of the river/water god'. Usually the practice was stopped by imperial investigators gave the cult a taste of their own medicine by drowning them, although in one case, the god of one river was married to the goddess of another.
 * Nuns: Brides of Christ.
 * Brides but never precisely wives in the physical sense. The Church as a whole is canonically the bride to Jesus' Bridegroom, so it's mostly metaphorical.
 * It's also a common Old Testament metaphor which really is less of a surprise then some might think(a lot of the New Testament metaphors were shout outs to the Old that readers or hearers were expected to understand). Israel was/is the wife of God. To the point that idolatry is compared to adultery.
 * In some parts of Finland, the traditional festivities that were held to appease a slain bear included a young woman or man playing the part of the bride or groom to the bear in order to strengthen the bond between the humans and their bear ancestor.
 * In Voudun, followers cement their devotion to Baron Samedi, the deity of death, with a ritual marriage. Then they call him down to possess people in a trance.
 * This is common practice in other Loa followings as well, such as Ogoun. Sometimes they're asked not to see their significant others on the loa's holy days to avoid jealousy.