Wesley Gene Mannion (born September 1970) is an Australian television personality, best known from the series The Crocodile Hunter as Steve Irwin's best friend and the former director of Australia Zoo.

Mannion's interest in reptiles began in the jungles surrounding his family's home in Malaysia, where his father was stationed as a member of the Royal Australian Air Force.

He and Irwin worked alongside each other at the zoo learning about reptile and animal husbandry and eventually moved on to capturing and relocating wild crocodiles.

Mannion started full-time at the Australia Zoo in 1988, working alongside Steve and gaining intimate knowledge of the care and management of wildlife.

In 2001, Mannion was involved in a serious incident in which a captive Australian saltwater crocodile named Graham bit him on the thigh.