The 2021 BYU Cougars baseball team represented Brigham Young University during the 2021 NCAA Division I baseball season. Mike Littlewood acted as head coach of the Cougars for a ninth consecutive season. The Cougars were picked to finish fourth in the WCC Pre-season poll. The Cougars entered the season after having watched the WCC cancel the 2020 season due to the COVID-19 pandemic. As a cost containment measure, the WCC cut the 2021 baseball tournament, so the regular season champion will got the conferences auto-bid to the NCAA Tournament. The Cougars went 23–27 overall, 15–12 in conference, and finished fourth in the standings.
2021 Roster
Schedule
! style=""| Regular season
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|- align="center" bgcolor="ffbbb" | February 20 || at Texas State || – || Bobcat Ballpark || ESPN+ || 4–5 || Austin Smith (1–0) || Easton Walker (0–1) || Tristan Stivors (1) || 165 || 0–1 || – |- bgcolor="#ccffcc" | February 20 || at Texas State || – || Bobcat Ballpark || ESPN+ || 9–4 || Bryce Robison (1–0) || Trevis Sundgren (0–1) || Reid McLaughlin (1) || 151 || 1–1 || – |- align="center" bgcolor="ffbbb" | February 22 || at Texas State || – || Bobcat Ballpark || Facebook || 6–11 || Austin Smith (2–0) || Boston Mabeus (0–1) || None || 700 || 1–2 || – |- bgcolor="#ccffcc" | February 23 || at Texas State || – || Bobcat Ballpark || ESPN+ || 7–6(10) || Mitch McIntyre (1–0) || Tristan Stivors (0–1) || None || 700 || 2–2 || – |- align="center" bgcolor="ffbbb" | February 24 || at #19 Texas || – || UFCU Disch-Falk Field || LHN || 1–3 || Cole Quintanilla (1–0) || Boston Mabeus (0–2) || Tanner Witt (1) || 1,474 || 2–3 || – |- align="center" bgcolor="ffbbb" | February 25 || at #19 Texas || – || UFCU Disch-Falk Field || LHN || 6–12 || Palmer Wenzel (1–0) || Bryce Robison (1–1) || None || 1,424 || 2–4 || – |- align="center" bgcolor="ffbbb" | February 26 || at #19 Texas || – || UFCU Disch-Falk Field || LHN || 1–11 || Ty Madden (1–1) || Cy Nielson (0–1) || None || 1,504 || 2–5 || – |- bgcolor="#ccffcc" | February 27 || at #19 Texas || – || UFCU Disch-Falk Field || LHN || 5–4 || Reid McLaughlin (1–0) || Caden Noah (0–1) || Mitch McIntyre (1) || 1,524 || 3–5 || – |-
|- align="center" bgcolor="ffbbb" | March 4 || at Oregon State || – || Goss Stadium at Coleman Field || P12+ OSU || 0–1 || Reid Sebby (2–0) || Mikade Johnson (0–1) || Jake Mulholland (2) || 0 || 3–6 || – |- align="center" bgcolor="ffbbb" | March 5 || at Oregon State || – || Goss Stadium at Coleman Field || P12+ OSU || 3–5 || Joey Mundt (1–0) || Carter Smith (0–1) || Nathan Burns (1) || 0 || 3–7 || – |- align="center" bgcolor="ffbbb" | March 6 || at Oregon State || – || Goss Stadium at Coleman Field || P12+ OSU || 3–4 || Jake Mulholland (1–0) || Tyson Heaton (0–1) || None || 0 || 3–8 || – |- align="center" bgcolor="ffbbb" | March 11 || at Utah || – || Smith's Ballpark || P12+ UT || 3–6 || Matthew Sox (2–0) || Mikade Johnson (0–2) || None || 0 || 3–9 || – |- align="center" bgcolor="ffbbb" | March 12 || at Utah || – || Smith's Ballpark || P12+ UT || 1–7 || Kyle Robeniol (1–1) || Cy Nielson (0–2) || None || 0 || 3–10 || – |- bgcolor="#CCCCCC" | March 13 || Utah || – || Larry H. Miller Field || BYUtv || colspan=7| Cancelled- Snowstorm |- align="center" bgcolor="ffbbb" | March 16 || at Dixie State || – || Bruce Hurst Field || WAC DN || 4–5 || Brayden Bonner (1–0) || Mikade Johnson (0–3) || None || 721 || 3–11 || – |- bgcolor="#ccffcc" | March 18 || * || – || George C. Page Stadium || WCC Net || 5–4 || Easton Walker (1–1) || CJ Fernandezees (1–1) || Reid McLaughlin (2) || 0 || 4–11 || 1–0 |- bgcolor="#ccffcc" | March 19 || * || – || George C. Page Stadium || || 9–2 || Boston Mabeus (1–2) || Jimmy Galicia (1–4) || None || 0 || 5–11 || 2–0 |- bgcolor="#ccffcc" | March 20 || * || – || George C. Page Stadium || || 4–1 || Cy Nielson (1–2) || Holden Chtistian (0–1) || Bryce Robison (1) || 0 || 6–11 || 3–0 |- bgcolor="#ccffcc" | March 23 || Utah Valley || – || Larry H. Miller Field || BYUtv.org || 11–7 || Boston Mabeus (2–2) || Jaxson Otis (0–2) || Bryce Robison (2) || 495 || 7–11 || – |- bgcolor="#ccffcc" | March 25 || San Francisco* || – || Larry H. Miller Field || BYUtv.org || 8–7(10) || Bryce Robison (2–1) || Max Jones (0–1) || None || 492 || 8–11 || 4–0 |- align="center" bgcolor="ffbbb" | March 26 || San Francisco* || – || Larry H. Miller Field || BYUtv.org || 6–10(10) || Jesse Barron (1–2) || Mitch McIntyre (1–1) || None || 798 || 8–12 || 4–1 |- align="center" bgcolor="ffbbb" | March 27 || San Francisco* || – || Larry H. Miller Field || BYUtv.org || 1–3 || Eric Reyzelman (1–1) || Jack Sterner (0–1) || Jesse Barron (3) || 799 || 8–13 || 4–2 |-