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Alice and Bob are in love with each other. However, they belong (or are considered to belong) to different factions that are locked in some kind of war with each other. This may be nations or civilizations in a regular war, the factions of a civil war, Feuding Families, or whatever.
The lovers are likely to not be Star-Crossed Lovers: In some works they are, but in others they are never kept apart. Instead, the drama is about how they have to fight for their love or what a high price they have to pay for it as people shun at least one of them as being Category Traitor. Or simply the internal struggle of hating one lantion/faction/family/whatever while loving one member of it. Don't be surprised if some Straw Loser antagonists goes all Entitled to Have You.
Compare Ethical Slut. If Love Across Battlelines is combined with Troubled Sympathetic Bigot, also compare Sex Is Evil and I Am Horny as well as Love Redeems. If the lover is an antagonist rather than a citizen/relative/whatever of the enemy nation/family/whatever, see instead Dating Catwoman if she remain a villain and Capulet Counterpart if she makes a Heel Face Turn / High Heel Face Turn. Note that a Love Across Battlelines plot often doesn't have this division into a good side and a villainous side - it is common that Both Sides Have a Point and that the protagonists view the conflict as a senseless Good Versus Good.
- A staple in the various Gundam series, as part of its traditional Love Hurts aesop. The Trope Codifiers are Lalah sune and Amuro Ray from the original one, followed by Kamille and Four...
- Iga-no-Oboro and Gennosuke Kouga from Basilisk. Their Ninja clans came with an Arranged Marriage for them in an attempt to stop their years-long fights (and they did like one another so they were okay with it), but the hostilities started anyway.
- Tosho Daimos has Princess Erika, the younger sister of the Anti-Villain Big Bad, and Kazuya Ryuuzaki alias The Hero.
- Histrionix and Melodrama in Asterix and the Great Divide.
- In Avatar, the protagonist is a human soldier falling in love with a warrior of the tribe he's hired to defend the evil megacorporation against.
- Oboro and Gennosuke of Shinobi (based oin the above mentiones Basilisk) are Star-Crossed Lovers from Feuding Families who are in the chosen 5 from each side to fight to the death.
- Sonja and Lucian in Underworld Rise of the Lycans. The never-ending feud between vampires and werewolves becomes a full-out war because of their relationship.
- Kat and Marco in The Shadow of the Lion. Their subplot includes several Shout Outs to Romeo and Juliet.
- Aral and Cordelia when they meet for the first time in Shards of Honor.
- Gawyn and Egwene end up on opposite sides in the schism in the White Tower in The Wheel of Time.
- Susanna and Marc in 1634: The Bavarian Crisis. Susanna was Catholic, and Marc a Calvinist, which was a pretty big deal during the 17th century.
- Torquato Tasso's Gerusalemme Liberata features a sub-plot involving a heathen amazon Clorinda and a christian knight Tancredi in love but on opposite sides. Eventually, they end up fighting each other (she was disguised in a full armor) and the girl is mortally wounded by Tancredi and dies.
- Tomorrow War series by Alexander Zorich began with neo-Zoroastrian colonists as a potential enemy whom Terran military with first-hand knowledge admire and envy for neat, honorable and determined traits even while abhorring dystopian sides of their society. The protagonist Space Cadet volunteered into joint operation against an alien threat, its participants were received with great hospitality and praised. He ended up in a Love Triangle with two lady officers, then betrothed to one, then the war began and he met both, but not before realizing that with his bride and a good friend somewhere there it doesn't feel the same as blowing up unknown Worthy Opponents.
- Succession has Rana and the Rix commando, as well Laurent and Nara who are on completely opposite sides of political spectrum and have tremendously differing views on the Emperor however Laurent comes to agree with Nara.
- Warrior Cats has this happen several times. Inter-Clan romances are banned specifically because they lead to the conflict of loyalty to Clan vs. loyalty to mate in a battle, but this doesn't stop these relationships from forming.
- This is one of the main themes of North and South US. Pretty much everyone experience this kind of heartache as the nation is torn apart. The main storyline is of the love between the northern family Hazard and the southern family Main.
- The main protagonists George Hazard and Orry Main are Heterosexual Life Partners, forced to fight on opposing sides in the war.
- George has a little brother and Orry has a little sister (Brett, not the other one) who are engaged to each other.
- Orry's Love Interest Madelaine is trapped in an Arranged Marriage with an evil southerner who is in another political camp in the South's internal power struggle.
- George's wife is Catholic, making some of George's relatives consider her an enemy in the religious war between Protestantism and Catholicism.
- Finally we have Virgilia, taking the "wrong" side in the ongoing "race war", falling in love with a black man.
- In the Mitsumete Knight franchise, this is one of the possible pairings, between the main male protagonist and Raizze Haimer:
- In the Dating Sim game, he's a Dolphan mercenary, she's one of the Eight Generals of Valpha-Valaharian, who will be, especially at the end of the game where she'll want to avenge her fallen leader and father by the hands of the protagonist, be torn between her duty and her love;
- In the RPG game, he's the Captain of Orcadia's Royal Knights, she's a Noble Fugitive from a aristocrat family of the fallen Parmet Kingdom; she'll try to assasinate him several times before gradually growing fond of him, and later, if you're following the Licence of Heartless Odd Number route, he reveals to her he's the Crown Prince of Parmet in hiding, and just as much out for revenge against Orcadia as her: after this, they'll completely fall in love with each other..
- Oichi and Nagamasa in some scenarios of Samurai Warriors, since Oichi's the younger sister of Oda Nobunaga.
- Kieri the angel and Buwaro the demon in Slightly Damned.
- Aldran's parents in Anti-HEROES, also an celestial and a fiend.
- For a time in Order of the Stick, Therkla the female orc ninja was in love with the bard Elan. He was at the time a close ally of the paladin-king Lord Hinjo, while she was The Dragon of an evil aristocrat trying to overthrow him. He had feelings for her as well, although he remained devoted to Haley.
- And tragically, she was poisoned by her master for her perceived betrayal and died in Elan's arms, and refused to be resurrected if she couldn't be with him.