2021 Mariners Baseball Roster
- Class: Freshman
- Height: 160
- B/T: L/L
- Position: LHP
- High School: Novato High School (San Marin)
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- Class: Freshman
- Height: 5'10
- B/T: R/R
- Position: OF
- High School: Terra Linda HS, San Rafael, CA
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- Class: Freshman
- Height: 6'1
- B/T: R/R
- Position: OF/P
- High School: Rancho Cotate HS, Rohnert Park, CA
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- Class: Sophomore
- Height: 6'2
- B/T: R/R
- Position: RHP/1B
- High School: San Marin HS, Novato, CA
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- Class: Freshman
- Height: 6'4
- B/T: L/L
- Position: 1B/LHP
- High School: Justin Siena HS, Napa, CA
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- Class: Freshman
- Height: 6'0
- B/T: R/R
- Position: INF
- High School: St. Francis High School
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- Class: Sophomore
- Height: 6'0
- B/T: R/R
- Position: 3B / SS
- High School: Redwood HS, Larkspur, CA
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- Class: Sophomore
- Height: 6'2
- B/T: R/R
- Position: 3B
- High School: St. Nicholas, Aruba
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- Class: Sophomore
- Height: 6'2
- B/T: L/L
- Position: LHP/OF
- High School: Sir Francis Drake HS, San Anselmo, CA
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- Class: Freshman
- Height: 5'10
- B/T: R/R
- Position: 2B
- High School: Pinole Valley High School
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#13
William
Tamura Miller
- Class: Freshman
- Height: 5'10
- B/T: R/R
- Position: C
- High School: Archbishop Riordan High School
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- Class: Freshman
- Height: 6'4
- B/T: R/R
- Position: Utl/P
- High School: St. Vincent's HS, Petaluma, CA
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- Class: Freshman
- Height: 6'2
- B/T: R/R
- Position: RHP
- High School: San Marin High School
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- Class: Freshman
- Height: 5'9
- B/T: L/L
- Position: OF/LHP
- High School: Marin Catholic High School
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- Class: Freshman
- Height: 5'10
- B/T: R/R
- Position: 1B
- High School: San Rafael High School
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- Class: Sophomore
- Height: 5'10
- B/T: R/R
- Position: RF
- High School: Rancho Cotate, Rohnert Park, CA
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- Class: Freshman
- Height: 6'3
- B/T: L/L
- Position: OF/LHP
- High School: Sonoma Valley High School
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- Class: Freshman
- Height: 6'3
- B/T: R/R
- Position: OF/P
- High School: Cardinal Newman, Santa Rosa, CA
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- Class: Freshman
- Height: 6'0
- B/T: R/R
- Position: C
- High School: Wooster High School
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- Class: Freshman
- Height: 5'10
- B/T: R/R
- Position: RHP
- High School: High School 1327
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- Class: Freshman
- Height: 6'1
- B/T: R/R
- Position: C
- High School: San Rafael High School
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- Class: Freshman
- Height: 6'4
- B/T: R/R
- Position: 1B
- High School: Archbishop Riordan High School
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- Class: Freshman
- Height: 6'2
- B/T: R/R
- Position: OF
- High School: Casa Grande HS, Petaluma, CA
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- Class: Freshman
- Height: 6'5
- B/T: R/R
- Position: 1B
- High School: Redwood High School
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- Class: Freshman
- Height: 6'5
- B/T: R/R
- Position: P
- High School: Rancho Cotate HS, Rohnert Park, CA
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- Class: Freshman
- Height: 6'9
- B/T: R/R
- Position: P
- High School: Redwood HS, Larkspur, CA
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