City Connect is a brand name for a line of alternate uniforms made by Nike, Inc. for Major League Baseball (MLB) teams. The uniforms feature different color schemes, typefaces, and graphic elements compared with the teams' typical home and away uniforms. The uniforms are designed to reflect the cultural aspects of each team's home city. Of MLB's 30 teams, 25 have a City Connect uniform as of May 2024, with three more teams scheduled to debut theirs later in the 2024 season. The New York Yankees and Oakland Athletics are the only two teams without a City Connect uniform.

A third jersey, alternative jersey, third kit, third sweater or alternative uniform is a jersey or uniform that a sports team can wear instead of its home outfit or its away outfit during games, often when the colors of two competing teams' other uniforms are too similar to contrast easily.