Domingo Rafael Tapia (born August 4, 1991) is a Dominican professional baseball pitcher who is a free agent.

He has previously played in Major League Baseball (MLB) for the Boston Red Sox, Seattle Mariners, Kansas City Royals, Oakland Athletics, and San Diego Padres.

[1] Tapia began the 2015 season with the Double-A Binghamton Mets, but after giving up five hits, eight walks, two HBP, and nine runs in 1.2 innings, he underwent Tommy John surgery in May 2015.

[5] In 2017, he split the season between the Triple-A Louisville Bats and the Double-A Pensacola Blue Wahoos, posting a 4–7 record and 4.08 ERA with 85 strikeouts between the two clubs.

[2][8] In 2019, he played for the Pawtucket Red Sox, Boston's Triple-A affiliate, posting a 5–4 win–loss record in 44 games (1 start) with two saves, a 5.18 earned run average (ERA), and 52 strikeouts in 66 innings pitched.

[1] Through 2019, including with Pawtucket, Tapia appeared in 242 games in 10 seasons of Minor League Baseball, accruing a 38–50 record with 4.14 ERA and four saves.

[1] During the delayed-start 2020 major league season, Tapia was added to Boston's player pool at the end of June.

[10] He made his MLB debut that day, against the Tampa Bay Rays; the first batter he faced, Nate Lowe, hit a home run.

He logged a 3.60 ERA in 5 games for Omaha before he was designated for assignment by the Royals on April 24, 2022, following the acquisition of Matt Peacock.