Elections to the National Baseball Hall of Fame for 2019 proceeded according to rules most recently amended in 2016. As in the past, the Baseball Writers' Association of America (BBWAA) voted by mail to select from a ballot of recently retired players. The results were announced on January 22, 2019, with the BBWAA electing Mariano Rivera, Roy Halladay, Edgar Martínez, and Mike Mussina to the Hall of Fame. Rivera and Halladay were elected in their first year of eligibility, while Martínez was elected in his last year of eligibility. Rivera became the first player to be unanimously elected, appearing on all 425 ballots; he broke Ken Griffey Jr.'s record of 99.32 percent, set in 2016.