The 2012 Seattle Mariners season was the 36th season in franchise history. The Mariners played their 13th full season (14th overall) at Safeco Field and finished with a record of 75–87, fourth place in the American League West.

Regular season

Game log Legend Mariners win Mariners loss PostponementBoldMariners team member

|- style="text-align:center; background:#bfb;" | 1 || March 28 || @ Athletics (@ Tokyo, Japan) || 3–1 (11) || Wilhemsen (1–0) || Carignan (0–1) || League (1) || 44,227 || 1–0 || W1 |- style="text-align:center; background:#fbb;" | 2 || March 29 || @ Athletics (@ Tokyo, Japan) || 1–4 || Colón (1–0) || Kelley (0–1) || Balfour (1) || 43,391 || 1–1 || L1 |- style="text-align:center; background:#bfb;" | 3 || April 6 || @ Athletics || 7–3 || Vargas (1–0) || McCarthy (0–1) || – || 35,067 || 2–1 ||W1 |- style="text-align:center; background:#bfb;" | 4 || April 7 || @ Athletics || 8–7 || Hernández (1–0) || Colón (1–1) || League (2) || 16,612 || 3–1 || W2 |- style="text-align:center; background:#fbb;" | 5 || April 9 || @ Rangers || 5–11 || Darvish (1–0) || Noesí (0–1) || || 42,003 || 3–2 ||L1 |- style="text-align:center; background:#fbb;" | 6 || April 10 || @ Rangers || 0–1 || Feliz (1–0) || Beavan (0–1) || Nathan (2) || 25,753 || 3–3 ||L2 |- style="text-align:center; background:#bfb;" | 7 || April 11 || @ Rangers || 4–3 || Luetge (1–0) || Nathan (0–2) || League (3) || 32,342 || 4–3 ||W1 |- style="text-align:center; background:#fbb;" | 8 || April 12 || @ Rangers || 3–5 || Holland (1–0) || Vargas (1–1) || Adams (1) || 31,513 || 4–4 ||L1 |- style="text-align:center; background:#fbb;" | 9 || April 13 || Athletics || 0–4 || Colón (2–1) || Hernández (1–1) || || 46,026 || 4–5 ||L2 |- style="text-align:center; background:#bfb;" | 10 || April 14 || Athletics || 4–0 || Noesí (1–1) || Milone (1–1) || || 21,071 || 5–5 ||W1 |- style="text-align:center; background:#bfb;" | 11 || April 15 || Athletics || 5–3 || Beavan (1–1) || Godfrey (0–2) || League (4) || 19,650 || 6–5 ||W2 |- style="text-align:center; background:#fbb;" | 12 || April 17 || Indians || 8–9 || R. Pérez (1–0) || Furbush (0–1) || C. Perez (3) || 12,461 || 6–6 ||L1 |- style="text-align:center; background:#bfb;" | 13 || April 18 || Indians || 4–1 || Vargas (2–1) || Lowe (2–1) || League (5) || 11,343 || 7–6 ||W1 |- style="text-align:center; background:#fbb;" | 14 || April 19 || Indians || 1–2 || Tomlin (1–1) || League (0–1) || Perez (4) || 12,942 || 7–7 ||L1 |- style="text-align:center; background:#fbb;" | 15 || April 20 || White Sox || 3–7 || Sale (2–1) || Noesí (1–2) || || 19,947 || 7–8 ||L2 |- style="text-align:center; background:#fbb;" | 16 || April 21 || White Sox || 0–4 || Humber (1–0) || Beavan (1–2) || || 22,472 || 7–9 ||L3 |- style="text-align:center; background:#fbb;" | 17 || April 22 || White Sox || 4–7 || Danks (2–2) || Millwood (0–1) || Santiago (4) || 19,975 || 7–10 ||L4 |- style="text-align:center; background:#bfb;" | 18 || April 24 || @ Tigers || 7–4 || Vargas (3–1) || Scherzer (1–2) || League (6) || 30,073 || 8–10 ||W1 |- style="text-align:center; background:#bfb;" | 19 || April 25 || @ Tigers || 9–1 || Hernández (2–1) || Wilk (0–3) || || 28,527 || 9–10 ||W2 |- style="text-align:center; background:#bfb;" | 20 || April 26 || @ Tigers || 5–4 || Furbush (1–1) || Porcello (1–2) || League (7) || 31,451 || 10–10 ||W3 |- style="text-align:center; background:#bfb;" | 21 || April 27 || @ Blue Jays || 9–5 (10) || Furbush (2–1) || Pérez (2–1) || || 24,303 || 11–10 ||W4 |- style="text-align:center; background:#fbb;" | 22 || April 28 || @ Blue Jays || 0–7 || Morrow (2–1) || Millwood (0–2) || || 30,765 || 11–11 ||L1 |- style="text-align:center; background:#fbb;" | 23 || April 29 || @ Blue Jays || 2–7 || Álvarez (1–2) || Vargas (3–2) || || 22,320 || 11–12 ||L2 |- style="text-align:center; background:#fbb;" | 24 || April 30 || @ Rays || 2–3 (12) || Howell (1–0) || League (0–2) || || 9,458 || 11–13 ||L3

|- style="text-align:center; background:#fbb;" | 25 || May 1 || @ Rays || 1–3 || Moore (1–1) || Noesí (1–3) || Rodney (8) || 9,972 || 11–14 ||L4 |- style="text-align:center; background:#fbb;" | 26 || May 2 || @ Rays || 4–5 || Shields (5–0) || Beavan (1–3) || Peralta (1) || 9,837 || 11–15 ||L5 |- style="text-align:center; background:#fbb;" | 27 || May 3 || @ Rays || 3–4 || Niemann (2–3) || Millwood (0–3) || Rodney (9) || 11,575 || 11–16 ||L6 |- style="text-align:center; background:#fbb;" | 28 || May 4 || Twins || 2–3 || Pavano (2–2) || Wilhemsen (1–1) || Capps (5) || 22,492 || 11–17 ||L7 |- style="text-align:center; background:#bfb;" | 29 || May 5 || Twins || 7–0 || Hernández (3–1) || Marquis (2–1) || || 28,437 || 12–17 ||W1 |- style="text-align:center; background:#bfb;" | 30 || May 6 || Twins || 5–2 || Noesí (2–3) || Blackburn (0–4) || || 23,913 || 13–17 ||W2 |- style="text-align:center; background:#bfb;" | 31 || May 7 || Tigers || 3–2 || Delabar (1–0) || Dotel (1–1) || || 14,462 || 14–17 ||W3 |- style="text-align:center; background:#fbb;" | 32 || May 8 || Tigers || 4–6 || Verlander (3–1) || Millwood (0–4) || Valverde (6) || 13,455 || 14–18 ||L1 |- style="text-align:center; background:#bfb;" | 33 || May 9 || Tigers || 2–1 || Vargas (4–2) || Putkonen (0–1) || League (8) || 15,655 || 15–18 ||W1 |- style="text-align:center; background:#fbb;" | 34 || May 11 || @ Yankees || 2–6 || Kuroda (3–4) || Hernández (3–2) || || 37,226 || 15–19 ||L1 |- style="text-align:center; background:#fbb;" | 35 || May 12 || @ Yankees || 2–6 || Hughes (3–4) || Noesí (2–4) || Logan (1) || 43,954 || 15–20 ||L2 |- style="text-align:center; background:#bfb;" | 36 || May 13 || @ Yankees || 6–2 || Millwood (1–4) || Pettitte (0–1) || || 41,631 || 16–20 ||W1 |- style="text-align:center; background:#fbb;" | 37 || May 14 || @ Red Sox || 1–6 || Lester (2–3) || Vargas (4–3) || || 37,334 || 16–21 ||L1 |- style="text-align:center; background:#fbb;" | 38 || May 15 || @ Red Sox || 0–5 || Beckett (3–4) || Beavan (1–4) || || 37,292 || 16–22 ||L2 |- style="text-align:center; background:#fbb;" | 39 || May 16 || @ Indians || 3–9 || Jiménez (4–3) || Hernández (3–3) || || 12,092 || 16–23 ||L3 |- style="text-align:center; background:#fbb;" | 40 || May 17 || @ Indians || 5–6 (11) || Smith (4–1) || League (0–3) || || 12,894 || 16–24 || |- style="text-align:center; background:#bfb;" | 41 || May 18 || @ Rockies || 4–0 || Millwood (2–4) || White (0–3) || || 34,887 || 17–24 || |- style="text-align:center; background:#bfb;" | 42 || May 19 || @ Rockies || 10–3 || Vargas (5–3) || Friedrich (1–1) || || 30,784 || 18–24 || |- style="text-align:center; background:#bfb;" | 43 || May 20 || @ Rockies || 6–4 || Beavan (2–4) || Guthrie (2–2) || || 36,662 || 19–24 || |- style="text-align:center; background:#bfb;" | 44 || May 21 || Rangers || 6–1 || Hernández (4–3) || Darvish (6–2) || || 18,672 || 20–24 || |- style="text-align:center; background:#fbb;" | 45 || May 22 || Rangers || 1–3 || Harrison (5–3) || Noesí (2–5) || Nathan (10) || 15,604 || 20–25 || |- style="text-align:center; background:#bfb;" | 46 || May 23 || Rangers || 5–3 || Millwood (3–4) || Feldman (0–2) || League (9) || 23,097 || 21–25 || |- style="text-align:center; background:#fbb;" | 47 || May 24 || Angels || 0–3 || Haren (2–5) || Vargas (5–4) || || 18,048 || 21–26 || |- style="text-align:center; background:#fbb;" | 48 || May 25 || Angels || 4–6 || Isringhausen (1–0) || League (0–4) || Downs (4) || 23,517 || 21–27 || |- style="text-align:center; background:#fbb;" | 49 || May 26 || Angels || 3–5 || Williams (5–2) || Hernández (4–4) || Frieri (2) || 29,483 || 21–28 || |- style="text-align:center; background:#fbb;" | 50 || May 27 || Angels || 2–4 || Wilson (6–4) || Noesí (2–6) || Downs (5) || 24,467 || 21–29 || |- style="text-align:center; background:#fbb;" | 51 || May 28 || @ Rangers || 2–4 || Harrison (6–3) || Delabar (1–1) || Nathan (11) || 41,384 || 21–30 || |- style="text-align:center; background:#bfb;" | 52 || May 29 || @ Rangers || 10–3 || Vargas (6–4) || Feldman (0–3) || || 34,531 || 22–30 || |- style="text-align:center; background:#bfb;" | 53 || May 30 || @ Rangers || 21–8 || Beavan (3–4) || Holland (4–4) || Iwakuma (1) || 43,580 || 23–30 ||

|- style="text-align:center; background:#fbb;" | 54 || June 1 || @ White Sox || 4–7 || Crain (1–0) || Kelley (0–2) || Reed (7) || 19,168 || 23–31 || |- style="text-align:center; background:#bfb;" | 55 || June 2 || @ White Sox || 10–8 (12) || Wilhelmsen (2–1) || Reed (0–1) || Iwakuma (2) || 26,200 || 24–31 || |- style="text-align:center; background:#fbb;" | 56 || June 3 || @ White Sox || 2–4 || Sale (7–2) || Millwood (3–5) || || 23,062 || 24–32 || |- style="text-align:center; background:#bfb;" | 57 || June 4 || @ Angels || 8–6 || Vargas (7–4) || Santana (2–7) || Wilhelmsen (1) || 36,079 || 25–32 || |- style="text-align:center; background:#fbb;" | 58 || June 5 || @ Angels || 1–6 || Richards (1–0) || Beavan (3–5) || || 35,021 || 25–33 || |- style="text-align:center; background:#bfb;" | 59 || June 6 || @ Angels || 8–6 || Kelley (1–2) || Williams (6–3) || Wilhelmsen (2) || 37,342 || 26–33 || |- style="text-align:center; background:#bfb;" | 60 || June 8 || Dodgers || 1–0 || Pryor (1–0) || Elbert (0–1) || Wilhelmsen (3) || 22,028 || 27–33 || |- style="text-align:center; background:#fbb;" | 61 || June 9 || Dodgers || 3–8 || Kershaw (5–3) || Vargas (7–5) || || 30,287 || 27–34 || |- style="text-align:center; background:#fbb;" | 62 || June 10 || Dodgers || 2–8 || Billingsley (4–4) || Beavan (3–6) || || 34,807 || 27–35 || |- style="text-align:center; background:#fbb;" | 63 || June 12 || Padres || 4–5 || Richard (3–7) || Hernández (4–5) || Street (6) || 13,084 || 27–36 || |- style="text-align:center; background:#fbb;" | 64 || June 13 || Padres || 0–1 || Marquis (3–5) || Noesí (2–7) || Street (7) || 13,931 || 27–37 || |- style="text-align:center; background:#fbb;" | 65 || June 14 || Padres || 2–6 || Vólquez (3–6) || Ramírez (0–1) || || 17,306 || 27–38 || |- style="text-align:center; background:#fbb;" | 66 || June 15 || Giants || 2–4 || Vogelsong (6–2) || Vargas (7–6) || Casilla (18) || 29,818 || 27–39 || |- style="text-align:center; background:#bfb;" | 67 || June 16 || Giants || 7–4 || Iwakuma (1–0) || Lincecum (2–8) || Wilhelmsen (4) || 30,589 || 28–39 || |- style="text-align:center; background: #bfb;" | 68 || June 17 || Giants || 2–1 || Wilhelmsen (3–1) || Romo (2–1) || || 40,603 || 29–39 || |- style="text-align:center; background:#fbb;" | 69 || June 18 || @ Diamondbacks || 1–7 || Miley (8–3) || Noesí (2–8) || || 24,284 || 29–40 || |- style="text-align:center; background: #bfb;" | 70 || June 19 || @ Diamondbacks || 12–9 (10) || Furbush (3–1) || Putz (1–4) || Wilhelmsen (5) || 21,568 || 30–40 || |- style="text-align:center; background: #fbb;" | 71 || June 20 || @ Diamondbacks || 10–14 || Cahill (6–5) || Vargas (7–7) || || 29,630 || 30–41 || |- style="text-align:center; background: #fbb;" | 72 || June 22 || @ Padres || 5–9 || Richard (5–7) || Millwood (3–6) || Street (9) || 30,053 || 30–42 || |- style="text-align:center; background: #bfb;" | 73 || June 23 || @ Padres || 5–1 || Hernández (5–5) || Marquis (3–7) || || 30,922 || 31–42 || |- style="text-align:center; background: #fbb;" | 74 || June 24 || @ Padres || 0–2 || Vólquez (4–7) || Noesí (2–9) || Street (10) || 27,529 || 31–43 || |- style="text-align:center; background: #fbb;" | 75 || June 25 || Athletics || 0–1 || Milone (8–5) || Ramírez (0–2) || Cook (5) || 17,101 || 31–44 || |- style="text-align:center; background: #bfb;" | 76 || June 26 || Athletics || 3–2 || Furbush (4–1) || Miller (2–1) || Wilhelmsen (6) || 12,411 || 32–44 || |- style="text-align:center; background: #fbb;" | 77 || June 27 || Athletics || 1–2 || Parker (4–3) || Iwakuma (1–1) || Cook (6) || 18,158 || 32–45 || |- style="text-align:center; background: #bfb;" | 78 || June 28 || Red Sox || 1–0 || Hernández (6–5) || Atchison (2–1) || || 20,692 || 33–45 || |- style="text-align:center; background: #fbb;"