Thea Louise Gill (/ˈteɪ.ə/; born April 5, 1970) is a Canadian actress best known for her starring role as Lindsay Peterson in the Showtime television series Queer as Folk.

Gill's big break came in 2000 when she auditioned for and received the role of Lindsay Peterson in Queer as Folk.

network original series Dante's Cove, billed as a "special guest star" in the role of Diana Childs.

In a July 2007 interview, Gill stated that she decided to move to Los Angeles for a year to an attempt to find longer-term acting roles.

In 2005, Gill appeared in director Richard Bell's Eighteen as a seductive World War II-era chanteuse.