This Week in Baseball (abbreviated as TWiB, pronounced phonetically) is an American television series that focuses on Major League Baseball highlights. Broadcast weekly during baseball season (and in its second incarnation, prior to marquee MLB games and during rain-delays) the program featured highlights of recent games, interviews with players, and other regular features. The popularity of the program, best known for its original host, New York Yankees play-by-play commentator Mel Allen, also helped influence the creation of other sports highlight programs, including ESPN's SportsCenter.

After its original syndicated run from 1977 to 1998, and gaining a revival in 2000 (which moved to Fox as a lead-in to its Saturday MLB coverage), TWiB was discontinued at the end of the 2011 Major League Baseball season, replaced by the new program MLB Player Poll.