The CIS Tower is a high-rise office building on Miller Street in Manchester, England. Designed for the Co-operative Insurance Society (CIS) by architects Gordon Tait and G. S. Hay, the building was completed in 1962 and rises to 118 m (387 ft) in height. As of August 2025, the Grade II listed building is the 16th-tallest in Greater Manchester and the tallest office building in the United Kingdom outside London. The tower remained as built for over 40 years, until maintenance issues on the service tower required an extensive renovation, which included covering its façade in solar panels.