Chloe Sullivan is a fictional character in the television series Smallville, based on the Superman and Superboy comics published by DC Comics. Portrayed by series regular Allison Mack, Chloe was an original character created exclusively for Smallville by series developers Alfred Gough and Miles Millar. Other than main protagonist Clark Kent, Chloe is the only main character to last the whole duration of the show, though Mack signed on for only five episodes in the tenth and final season. The character has also appeared in various literature based on Smallville, a web series, and was later adapted back into the original Superman comics that inspired Smallville.

Smallville is an American superhero television series developed by writer-producers Alfred Gough and Miles Millar, based on the DC Comics character Superman created by Jerry Siegel and Joe Shuster. The series was produced by Millar/Gough Ink, Tollin/Robbins Productions, DC Comics and Warner Bros. Television. Initially broadcast by the WB, the show premiered on October 16, 2001. After its fifth season, the WB and UPN merged to form The CW, the series' later United States broadcaster until its tenth and final season ended on May 13, 2011.