Union Plaza, High-rise building in Oklahoma City, United States

Union Plaza is an 18-story office building at 3030 Northwest Expressway in Oklahoma City, Oklahoma. It is a high-rise of the city's business district, listed among places sharing the Union Plaza name alongside the Las Vegas hotel and casino later renamed Plaza Hotel & Casino.

The building was constructed in 1982 during a period of vertical expansion in Oklahoma City. Its completion contributed to the modernization of the city's business infrastructure.

Union Plaza shares its name with the Union Plaza Hotel and Casino in Las Vegas, the former name of the Plaza Hotel & Casino, and with a separate Union Plaza in Oklahoma City. The Oklahoma City building at 3030 Northwest Expressway is an office tower, not a hotel or casino, so visitors should not confuse the two.

Union Plaza stands at 3030 Northwest Expressway, on Oklahoma City's northwest business corridor rather than downtown. Visitors reach it by car along the expressway; the site provides both underground and surface parking. The 18 floors are served by elevators from the lobby, and tenants can arrange meeting rooms and high-speed internet.

Union Plaza shares its name with two unrelated places: an office tower in Oklahoma City and the former name of the Plaza Hotel & Casino in Las Vegas, which opened in 1971 as the Union Plaza Hotel and was renamed in 1982.