Rurouni Kenshin (るろうに剣心, Rurouni Kenshin^?) is a set of manga and anime series created by mangaka Nobuhiro Watsuki, set during the early years of the Meiji period in Japan. The English versions of the OVAs as well as the movie are sold under the Samurai X name. In other countries, the TV series itself is better known as "Samurai X", as explained later in this article.

The series tells the story of an assassin named Himura Kenshin, who was known as the Battōsai (romanized as Battōsai in the English manga and as Battousai in the English anime, it is translated as the nickname the manslayer). Kenshin later grieves for all the lives he's taken, and has vowed that he will never kill again.

The manga originally appeared in the Japanese Shonen Jump Weekly Anthology, and the completed work consists of 28 tankōbon volumes. The United States release of the manga is being handled by VIZ Media. Rurouni Kenshin is subtitled Wandering Samurai in some English releases.