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The Calgary Tower is a free standing observation tower in the downtown core of Calgary, Alberta, Canada. Originally called the Husky Tower, it was conceived as a joint venture between Marathon Realty Company Limited and Husky Oil as part of an urban renewal plan and to celebrate Canada's centennial of 1967. The tower was built at a cost of and weighs approximately 10,884 tonnes, of which 60% is below ground. It opened to the public on June 30, 1968 as the tallest structure in Calgary, and the tallest in Canada outside Toronto. It was renamed the Calgary Tower in 1971. The building is a founding member of the World Federation of Great Towers.

The project was originally conceived as a joint venture by Marathon Realty (the real estate subsidiary of Canadian Pacific Railway) and Husky Oil for their new head offices in Calgary. They proposed building the tower both to honour Canada's centennial year of 1967 and to encourage urban renewal and growth of downtown Calgary. The structure was designed by A. Dale and Associates, and was designed to withstand earthquakes and winds of up to
The urban renewal project was announced to the public on December 10, 1965, and consisted of a transport terminal, hotel, parking, office facility and a 550 feet (168 m) "restaurant observation tower". The chosen site housed Canadian Pacific's Calgary passenger station which was demolished a year after the announcement to make way for the development. The provincial government reviewed the tower proposal for consideration as a publicly funded centennial project, but Public Works Minister Frederick C. Colborne recommended against the use of public funds for the project. The concept of a centennial tower was originally proposed for Edmonton, but the project was opposed by residents near the chosen site. Construction began on February 19, 1967, and completed in 15 months at a cost of $3.5 million. The column of the tower was built from an unprecedented continual pour of concrete. Pouring began May 15, 1967, and was completed 24 days later at an average growth of 25 feet (8 m) per day, a rate that was praised by industry officials as an "amazing feat of technical and physical workmanship". Upon completion, the Husky Tower stood tall and was the tallest structure of its type in North America. The Husky Tower officially opened on June 28–30, 1968, in three separate ceremonies.

Marathon Realty acquired a controlling interest in the tower in 1970. The structure was formally renamed the Calgary Tower on November 1, 1971 as a tribute to the citizens of the city. It is still called the Husky Tower by airport officials, however, to distinguish it from the tower at the Calgary International Airport. It celebrated its 25th anniversary in 1993, a year in which it topped 500,000 visitors for the first time. An LED, multicolour exterior lighting system was added and was first tested on August 1, 2014. 12 lights were added to the crown and 24 to the exterior floor. Each light has been programmed to be able to create over 16.5 million combinations of colour and lighting effects. It has been used since October 8, 2014, becoming a more noticeable part of the city skyline at night.

The Calgary tower features a revolving restaurant, Sky 360. The restaurant does a complete rotation every 45 minutes during the day and every 60 minutes in the evening. The base of the tower is connected through the +15 skyway network to One Palliser Square, Fairmont Palliser Hotel and EnCana Place. Stairs to the observation deck are not opened to the public, but have been used on occasions for publicity, as well as for an annual charity stair climbing race. There are 802 steps. The tower also features a carillon that was presented to the city by the local Dutch community in 1975 as part of the city's centennial celebrations. It was played daily at noon until removed in 1987 for storage. The carillon has since been refurbished and restored to operation.