Kelvin High School, Public secondary school in River Heights, Winnipeg, Canada.

Kelvin High School is a public high school in the River Heights neighbourhood of Winnipeg, Canada, teaching grades 9 to 12 within the South District of the Winnipeg School Division. Its current building dates from 1964, replacing the original 1912 structure. A 2002-03 addition added two art rooms, two classrooms and a computer lab, and the school has an Active Living Centre.

The school was founded in 1912 as Kelvin Technical High School, making it one of Winnipeg's early secondary schools. It moved to its current building in 1964 after the original structure was torn down.

The school is known for its French Immersion program, where classes are taught in French and students from different parts of the city study together. The International Baccalaureate program also draws families looking for an internationally oriented education.

The school sits on Kingsway Avenue in River Heights and is reachable by public transit. Since it is an active school, visitors should contact the administration in advance to find out which areas are open to the public.

The school takes its name from Scottish physicist William Thomson, 1st Baron Kelvin, best known for his work on temperature measurement. The school's S.E.E.D.S program lets students take part in hands-on environmental projects that go well beyond standard classroom work.