Kate Trotter (born February 5, 1953) is a Canadian film, television and stage actress.

Her television roles include appearances in Wild Roses, Covert Affairs, Lost Girl, The Newsroom, Paradise Falls, Earth: Final Conflict, Kung Fu: The Legend Continues, The Jane Show, Republic of Doyle, Blue Murder, Murdoch Mysteries and Sue Thomas F.B. Eye, while her film roles have included Beyond Borders, Joshua Then and Now, Murder in the Hamptons, Murder in Space, Taking a Chance on Love, Clarence and Tru Love. She won a Gemini Award for Guest Actress in a Dramatic Series in 2003 for Blue Murder.

Her stage roles have included Miss Havisham in Great Expectations, Madge Kendal in The Elephant Man, Alma in Summer and Smoke, Juliet in Romeo and Juliet, Hermione in The Winter's Tale, Katie in Quiet in the Land and Ann Whitfield in Man and Superman. She has been a three-time Dora Mavor Moore Award winner for her stage roles.

In addition to her own acting, Trotter has also taught acting at George Brown College and the Armstrong Studio, and works as a professional communication coach.