Rainbow Tower, Bell tower in Niagara Falls, Ontario, Canada.

Rainbow Tower is a 50.3-metre tower of light grey rectangular stone blocks at the Rainbow Plaza border station of the Rainbow Bridge in Niagara Falls, Ontario. Its upper faces carry bands of narrow vertical openings, with rows of small square windows below. Completed in 1947 to a design by William Lyon Somerville, it housed the Rainbow Carillon of 55 bells.

The tower was designed by William Lyon Somerville and completed in 1947, following construction delays caused by World War II. It was built at the Rainbow Bridge border station between Canada and the United States.

The bells ring three times daily throughout the year, creating musical moments that carry across the Niagara Falls region. Visitors passing by can experience these performances as part of the local soundscape.

The tower stands at the Rainbow Plaza border station on the Canadian side of the Rainbow Bridge, so it is seen while crossing between Ontario and New York. The carillon was decommissioned in March 2025 and the bells removed, with scaffolding on the southeast face until work finished in late summer 2025. The instrument could still be played manually after 2002, though it was mostly automated.

The largest bell measures about 2.4 meters across and produces an E note as the instrument's fundamental tone. Combined with the other 54 bells, it forms a musical instrument weighing roughly 43 tons total.