United States Post Office and Courthouse, Federal courthouse and post office in Oklahoma City, United States.

The United States Post Office and Courthouse, also called the Federal Building, stands at 224 South Boulder Avenue in Tulsa. Completed in 1917 in the Classical Revival style, it was extended substantially in 1933 under supervising architect James A. Wetmore. It has been called "the postal beauty of the southwest… a marble, bronze and granite memorial to its builders".

The United States Post Office and Courthouse in Tulsa was completed in 1917 at 224 South Boulder Avenue, with James A. Wetmore as supervising architect. It housed the United States District Court for the Eastern District of Oklahoma until 1925, when redistricting made it a courthouse of the Northern District. A substantial extension followed in 1933, again under Wetmore. It was listed on the National Register of Historic Places on March 24, 2000.

The building's nickname, "the postal beauty of the southwest… a marble, bronze and granite memorial to its builders", comes from its Classical Revival finish. Visitors can still see the post office in operation alongside the U. S. Bankruptcy Court and the National Labor Relations Board, which now occupy the former courtrooms and offices.

The building stands at 224 South Boulder Avenue in downtown Tulsa, not Oklahoma City. It is an active federal building housing the U.S. Bankruptcy Court and the National Labor Relations Board, so expect security screening and limited access to court areas. Check the court's own guidance before visiting.

The supervising architect for both the 1917 building and its 1933 extension was James A. Wetmore. A 1930s description called it "the postal beauty of the southwest… a marble, bronze and granite memorial to its builders". It joined the National Register of Historic Places on March 24, 2000, and is a contributing structure of the Oil Capital Historic District.