Trevor William Hoffman is an American former professional baseball pitcher who played 18 years in Major League Baseball (MLB) from 1993 to 2010. A long-time closer, he pitched for the Florida Marlins, San Diego Padres, and Milwaukee Brewers, including more than 15 years for the Padres. Hoffman was the major leagues' first player to reach the 500- and 600-save milestones, and was the all-time saves leader from 2006 until 2011. He was inducted into the Baseball Hall of Fame in 2018. Hoffman currently serves as senior advisor for baseball operations for the Padres.

In baseball, a closing pitcher, more frequently referred to as a closer, is a relief pitcher who specializes in getting the final outs in a close game when his team is leading. The role is often assigned to a team's best reliever. Before the 1990s, pitchers in similar roles were referred to as a fireman, short reliever, and stopper. A small number of closers have won the Cy Young Award. Eight closers have been inducted into the Baseball Hall of Fame: Dennis Eckersley, Rollie Fingers, Goose Gossage, Trevor Hoffman, Mariano Rivera, Lee Smith, Bruce Sutter and Hoyt Wilhelm.