Kyō Kara Ore Wa!! (今日から俺は!!, "Starting Today, It's My Turn!!") is a Japanese manga series written and illustrated by Hiroyuki Nishimori. The manga was initially published in Shogakukan's shōnen manga magazine Shōnen Sunday Zōkan, running monthly from September 1988 to August 1990. The series was then transferred to Weekly Shōnen Sunday and serialized from September 1990 to November 1997. Its chapters were collected in 38 tankōbon volumes. A four-chapter manga sequel, titled Kyō Kara Ore wa!!: Yūsha Sagawa to Ano Futari-hen, was serialized in Shōnen Sunday S from November 2018 to February 2019 and collected in a single tankōbon volume.

Kyō Kara Ore Wa!! was adapted into a 10-episode original video animation (OVA) series by Pierrot, released from April 1993 to December 1997. The series also spawned a V-Cinema direct-to-video live-action series launched from 1993 to 1997, and a live-action film, featuring the same cast and staff from the V-Cinema series, premiered in February 1994. A Japanese television drama adaptation was broadcast on Nippon Television in 2018, and a live-action film, featuring the same cast and staff from the drama, premiered in July 2020.

By March 2018, the Kyō Kara Ore Wa!! manga had over 40 million copies in circulation.