BOK Tower is a skyscraper in Downtown Tulsa, Oklahoma. At 203 m (667 ft) in height, the 52-story tower was the tallest building in Oklahoma until surpassed by Devon Tower in 2011. It was built in 1976 and designed by Minoru Yamasaki & Associates, the same architect who designed the World Trade Center's Twin Towers in New York City. This structure is based closely on Tower 1; former CEO John Williams liked the design of the WTC so much he hired the same architect to build him a 1/2 scale model of Tower 1.

BOK Financial Corporation — pronounced as letters, "B-O-K" — is a financial services holding company headquartered in Tulsa, Oklahoma. Offering a full complement of retail and commercial banking products and services across the American Midwest and Southwest, the company is one of the 50 largest financial services firms in the U.S., and the largest in Oklahoma.