Stephen Mayne is an Australian journalist, local government councillor, and self-described shareholder activist. He is a recipient of the Walkley Award. Mayne worked for various media outlets and served as a media adviser to the Premier of Victoria, Jeff Kennett, from 1992 to 1994. In 1997, he appeared on ABC TV's Four Corners as a whistleblower regarding Kennett's share dealings.
In 2000, Mayne founded Crikey, an online independent news service, which he sold in 2005.