Worcester Red Sox

In February 2015, a group of New England business leaders, led by Larry Lucchino, purchased the Pawtucket Red Sox, Triple-A affiliate of the Boston Red Sox since 1973. By mid-April, ownership was exploring moving the team from Pawtucket to Providence, Rhode Island. In September, Governor of Rhode Island Gina Raimondo stated that the land in Providence being considered for a stadium, "was not suitable and there were too many obstacles that remained." During 2016, a feasibility study was conducted on potential renovations of the team's Pawtucket ballpark, McCoy Stadium; and from mid-2017 to mid-2018, building a new ballpark in Pawtucket was explored.

A financing arrangement for partial public-funding of new stadium in Pawtucket was rejected by team ownership, who announced on August 17, 2018, that the team would relocate to a new stadium in Worcester, Massachusetts, in April 2021. While it was initially reported that team would be named the Worcester Red Sox, the club announced a "name-that-team" competition in November 2018. The team name was officially announced on November 25, 2019, and confirmed to be the Worcester Red Sox with "WooSox" as the nickname. The team's mascot, Smiley Ball, was introduced in Worcester on October 2, 2020. The dog mascot, Woofster, was introduced in Worcester on August 26, 2021. Roberto the Rocket was also introduced in Worcester on May 19, 2022. The red heart mascot, Clara the Heart of the Commonwealth, was unveiled on May 21, 2024.

Like Providence, Worcester fielded a short-lived major league ballclub in the early 1880s, the Worcester Worcesters, who competed in the National League.

In conjunction with Major League Baseball's restructuring of Minor League Baseball in 2021, the Red Sox were organized into the 20-team Triple-A East. Billy McMillon, who had previously managed the Pawtucket Red Sox, was named Worcester's first manager. The team's first games were originally planned for April; however, the start of the Triple-A season was delayed into May. The team released its debut roster on May 3, and opened the season on May 4 with a loss against the Buffalo Bisons in a game played in Trenton, New Jersey.

The team played select games as "Los Wepas de Worcester" when participating in the Copa de la Diversión, a Minor League Baseball celebration of Hispanic and Latino heritage. In December 2021, team was named winners of the Copa de la Diversión series, and were awarded the "Fun Cup".

In 2022, the Triple-A East became known as the International League, the name historically used by the regional circuit prior to the 2021 reorganization of the minor leagues. The 2022 WooSox used the most players by any Red Sox Triple-A team, 75, surpassing the prior record of 70 held by the Pawtucket Red Sox of 1995 and 2006.

In November 2023, principal owner Larry Luchino stated he was actively looking to sell the team, explaining that at age 78 he wanted to "move on to blissful retirement." Later that month, the team was purchased by Diamond Baseball Holdings, who also own the Red Sox's Double-A and Single-A franchises, the Portland Sea Dogs and Salem Red Sox.