Allison Christin Mack (born July 29, 1982) is an American actress. She played Chloe Sullivan on the superhero series Smallville (2001–2011) and had a recurring role on the comedy series Wilfred (2012–2014).
Mack was a member of NXIVM, a cult and multi-level marketing company. In 2018 she was arrested by federal authorities on charges of sex trafficking, sex trafficking conspiracy and forced labor conspiracy related to her involvement in NXIVM and its subgroup, DOS. Mack pleaded guilty to racketeering and racketeering conspiracy charges and in 2021 was sentenced to three years in prison. She served 21 months in Federal Correctional Institution, Dublin, in California and was released in July 2023.