Allison Christin Mack (born July 29, 1982) is an American actress, known for her roles as Chloe Sullivan on the WB/CW series Smallville and as Amanda on the FX series Wilfred.

In 2018, Mack gained publicity as one of the top-ranking members of NXIVM, a group accused of engaging in blackmail, sex trafficking and forced labor, for which some experts have called it a cult. On April 20, 2018, Mack was arrested by the FBI on charges of sex trafficking, sex trafficking conspiracy and forced labor conspiracy.