633 17th Street, Modern skyscraper in downtown Denver, United States

633 17th Street is a 32-story, 434-foot (132 m) high-rise completed in 1974, formerly First Interstate Tower North. It stands next to the 386-foot 621 17th Street, the former First Interstate Tower South; together the two buildings form the First of Denver Plaza.

Completed in 1974 as First Interstate Tower North, named for its main tenant First Interstate Bancorp, the 32-story tower was then Denver's tallest at 434 feet. It held that title until 1978, when the 507-foot 555 17th Street surpassed it. After First Interstate merged with Wells Fargo in 1996, the building took its street address as its official name.

The building's name changed from First Interstate Tower North to its street address after First Interstate Bancorp merged with Wells Fargo in 1996. It stands beside the older First Interstate Tower South, now 621 17th Street, and the pair form the First of Denver Plaza.

The tower occupies the block bounded by 17th, 18th, California and Stout streets, next to its sister building at 621 17th Street; both form First of Denver Plaza. The entrance is on 17th Street. As a private office building, interior access is limited to tenants and their guests.

Exterior shots of 633 17th Street were used in the opening credits of the television series Dynasty. The tower was still called First Interstate Tower North when those shots were filmed, before the 1996 Wells Fargo merger turned its address into its name.