The 2021 Fairfield Stags baseball team represented Fairfield University during the 2021 NCAA Division I baseball season. The Stags played their home games at Alumni Baseball Diamond as a member of the Metro Atlantic Athletic Conference. They were led by head coach Bill Currier, in his 10th season at Fairfield.
Fairfield qualified for the NCAA tournament for the first time since 2016, and qualified for the first time ever as an at-large team. They reached the Austin Regional final, before losing to Texas.
Previous season
The 2020 Fairfield Stags baseball team notched a 2–9 (0–0) regular season record. The season prematurely ended on March 12, 2020 due to concerns over the COVID-19 pandemic.
Game log
! colspan=2 style="" | Regular season (33–1) |-
|- align="center" bgcolor="ddffdd" | March 20 || 11:30 am || SSN || || || Alumni Baseball Diamond || W 7–4 || McLoughlin (1–0) || Warner (0–1) || Grabek (1) || 26 || 1–0 || 1–0 || Report |- align="center" bgcolor="ddffdd" | March 20 || 2:15 pm || SSN || Canisius || || Alumni Baseball Diamond || W 13–4 || Sansone (1–0) || Barberio (0–1) || — || 25 || 2–0 || 2–0 || Report |- align="center" bgcolor="ddffdd" | March 21 || 11:30 am || SSN || Canisius || || Alumni Baseball Diamond || W 6–3 || Signore (1–0) || Frank (0–1) || Cafaro (1) || 50 || 3–0 || 3–0 || Report |- align="center" bgcolor="ddffdd" | March 21 || 2:15 pm || SSN || Canisius || || Alumni Baseball Diamond || W 8–0 || Noviello (1–0) || Fron (0–1) || — || 50 || 4–0 || 4–0 || Report |-