Stephen Robert Irwin (February 22, 1962 – September 4, 2006), known simply as Steve Irwin and nicknamed "The Crocodile Hunter", was an Australian wildlife expert and television personality. He achieved world-wide fame from the television program The Crocodile Hunter, an internationally broadcast wildlife documentary series co-hosted with his wife Terri Irwin. Together, they also co-owned and operated Australia Zoo, founded by his parents in Beerwah, Queensland. He died in 2006 after his chest was fatally pierced by a stingray barb.

The Sea Shepherd Conservation Society ship MV Steve Irwin was named in his honour, christened by his wife Terri, who said "If Steve were alive, he'd be aboard with them!"

Steve Irwin (born 19 June 1983) is a rugby league player, not to be confused with Steve Irwin, the late media personality.