The 2017 World Baseball Classic (WBC) was an international professional baseball competition, composed of 16 competing nations, held from March 6 to 22, 2017. It was the fourth iteration of the World Baseball Classic. The first-round hosts were Seoul (South Korea), Tokyo (Japan), Miami (Florida, United States), and Zapopan (Mexico). The second-round hosts were Tokyo and San Diego (California, United States), and the championship round was played in Los Angeles (California, United States).

Twelve of the sixteen competing nations qualified based on their performance during the first round of the 2013 tournament; the remaining four nations were the winners of four qualification tournaments that took place in February, March, and September 2016. Two of the four qualifiers, Colombia and Israel, made their first appearance in the WBC, and both secured their positions for the 2023 World Baseball Classic.

The Netherlands, Japan, Puerto Rico, and the United States advanced to the championship round. Defending champion Dominican Republic was eliminated in the second round. The United States defeated Puerto Rico to win the championship game, 8–0. Marcus Stroman was named tournament MVP. He made three starts for the U.S. and posted a 2.35 ERA in 151⁄3 total innings, including 6 shutout innings in the championship game.

The top three teams from each pool of the first round of the 2013 World Baseball Classic automatically qualified.

The first and second rounds of the tournament were played in round-robin format, with each team playing each other team in their pool once, as was the case in 2006. However, in an effort to reduce the likelihood that a team would be eliminated on statistical tiebreakers, the tournament schedule allowed for a seventh game at each pool-play site.

In either of the latter cases, the statistics used to rank the tied teams were:

Six stadiums were used during the main tournament:

Note: Numbers in parentheses indicate positions in the WBSC World Rankings at the time of the tournament.