Canterra Tower

400 Third (formerly known as Devon Tower from 2011 - 2023, and Canterra Tower from opening until 2011) is a skyscraper in Calgary, Alberta, Canada.

Located at 400 3rd Avenue SW, it stands at 177 m or 45 storeys tall. The building was completed in 1988 and was designed by WZMH Architects in the postmodern style. It was built with glass curtain walls on all sides.

The building is owned and managed by global real estate investor, developer and owner Oxford Properties, and major tenants in the building include Norton Rose Fulbright LLP, one of Canada's largest law firms.