
Onimusha is a series of video games developed and published by Capcom. It makes use of the historic figures that shaped Japan's history, retelling their stories with supernatural elements. Most of the games are of the action-adventure genre, a combination of third-person combat and puzzle elements. The player protagonist wields the power of the Oni, enabling them to fight the Genma, the main enemy in the series. As of December 31, 2019, the series has sold a total of 8.3 million units worldwide, making it Capcom's eighth best-selling franchise, behind Resident Evil, Monster Hunter, Street Fighter, Mega Man, Devil May Cry, Dead Rising, and Marvel vs. Capcom.

Onimusha 2: Samurai's Destiny, released in Japan as Onimusha 2 , is an action-adventure game developed and released by Capcom for the PlayStation 2. It is the second installment in the Onimusha series of video games released in March 2002. Set in medieval Japan, the plot revolves around a new protagonist, Jubei Yagyu, who is on a quest of revenge as he battles a demon army led by Nobunaga Oda, a sinister warlord who eliminated the Yagyu clan. Across his quest, Jubei learns of his oni heritage which grants him powers to slay the demons and meets new allies who also wish to defeat Nobunaga and his army of Genma.

Onimusha 3: Demon Siege, released in Japan and Europe as Onimusha 3 , is an action-adventure game developed and published by Capcom. It is the third game of the Onimusha series and was released for the PlayStation 2 on April 27, 2004. It was later ported to Windows on December 8, 2005. The story focuses on the returning hero, swordsman Hidemitsu Samanosuke Akechi, who is in his quest to defeat his nemesis, Nobunaga Oda, who wishes to conquer Japan with his army of demons known as Genma. However, Samanosuke changes places with a French officer from the future named Jacques Blanc, and both have to adapt to their new worlds to get rid of Genma army and stop Oda Nobunaga's ambitions to conquer the world.

Onimusha Blade Warriors is a multi-player game from the Onimusha series. Similar to Super Smash Bros., Blade Warriors is a simple 2D fighter game featuring many of the characters of the Onimusha franchise.

Onimusha Tactics is a strategy/tactical role-playing game installment in the Onimusha series released for the Game Boy Advance as the first game in the series to be released for the Nintendo system. It does not follow the storyline of the previous PlayStation 2 games and is considered a side story. However, the game features a similar plot: a samurai who possesses the Oni Gauntlet can become the Onimusha and fights against Nobunaga and his army of genma.

Onimusha: Dawn of Dreams, released in Japan as Shin Onimusha: Dawn of Dreams , is an action-adventure video game developed and published by Capcom for the PlayStation 2. It is the sixth installment of Capcom's Onimusha overall series, while being the fourth game in the canonical main series. It was released in Japan in January 2006, followed by North American and European releases in March 2006. The plot is set in ancient Japan decades after the events of Onimusha 3: Demon Siege and focuses on Soki, a warrior who possesses Oni powers. Soki is on a quest to stop Hideyoshi Toyotomi, who has unified Japan in league with his demonic army of Genma, and he also joins forces with several allies who share the same goal in stopping Hideyoshi plans of wanting to conquer the world.

Onimusha: Warlords, known in Japan as Onimusha , is an action-adventure video game and the first entry of the Onimusha series, released for the PlayStation 2 in 2001. An updated form as Genma Onimusha for the Xbox was released in 2002. The original Warlords version was ported to Microsoft Windows, although it was only available in China and Russia. A remaster for Nintendo Switch, PlayStation 4, Xbox One and Windows via Steam was released on January 15, 2019.