Black Lagoon (stylized in all caps) is a Japanese manga series written and illustrated by Rei Hiroe. It has been published in Shogakukan's seinen manga magazine Monthly Sunday Gene-X since April 2002, with its chapters collected in twelve tankōbon volumes as of August 2021. In North America, the manga is licensed for English release by Viz Media. The manga was adapted into an anime television series by Madhouse, which was broadcast for two seasons of twelve episodes each in 2006, followed by a five-episode original video animation (OVA) series released from July 2010 to June 2011.