O.G. Original Gangster is the fourth studio album by American rapper Ice-T, released May 14, 1991 by Sire Records. Recording took place from July 1990 to January 1991 in Los Angeles, California. Its production was handled by seven producers: Afrika Islam, Beatmaster V, Bilal Bashir, DJ Aladdin, Nat The Cat, SLJ and Ice-T himself, who also served as executive producer.

It features guest appearances from Body Count, Prince Whipper Whip and various Rhyme Syndicate artists, such as Donald D, Evil E and Randy Mac.

From contemporary reviews, the NME stated that the album was Ice-T's "best shot yet; riotous vignettes from a decaying America full of devious humour and striking pathos – all those things NWA profess to be but clearly aren't." The review commented on the album's production stating Afrika Islam production as "slamming" noting that "the music is always restlessly inventive in catering for your solar plexus (even on the hardcore/Heavy Metal crossover token track) – complements highlights like the sad, droning 'The Tower', the optimistic 'Escape From The Killing Fields' (a scathing re-write of Public Enemy's 'Black Steel In The Hour Of Chaos' that explains the original metaphor) and the out-of-character bad-tempered 'Lifestyles Of The Rich And Infamous'".