Martin Colin Sacks (born 16 October 1959) is an award-winning Australian actor, chiefly known for his 12-year role on Blue Heelers from 1993–2005.
Sacks took the role of Detective P.J. Hasham in the 1993 series Blue Heelers. The show rocketed him to fame, most notably his 7-year "will-they-or-won't-they" relationship with Constable Maggie Doyle (Lisa McCune) which ended with her death in the programme's seventh season.
Sacks also starred in the 2008 Australian TV hit, Underbelly, portraying underworld loanshark Mario Condello. In 2010, Sacks guest starred in three different shows – City Homicide, Rescue: Special Ops and Sea Patrol.
Martin in Wentworth played the role of Derek Channing until Season Six of Wentworth.