| Year: | 2005 |
| Team: | Oregon State Beavers |
| Sport: | baseball |
| Conference: | Pacific-10 Conference |
| Conference Link: | Pac-12 Conference |
| Short Conf: | Pac-10 |
| Coachrank: | 7 |
| Cbrank: | 7 |
| Record: | 46–12 |
| Conf Record: | 19–5 |
| Head Coach: | Pat Casey |
| Hc Year: | 11th |
| Asst Coach1: | Marty Lees |
| Ac1 Year: | 2nd |
| Pitch Coach: | Dan Spencer |
| Pc Year: | 9th |
| Stadium: | Goss Stadium at Coleman Field |
| Champion: | Pac-10 Conference champions Corvallis Regional champions Corvallis Super Regional champions |
| Tourney: | College World Series |
| Tourney Result: | 0–2 |
The 2005 Oregon State Beavers baseball team represented Oregon State University in the 2005 NCAA Division I baseball season. The Beavers played their home games at Goss Stadium at Coleman Field. The team was coached by Pat Casey in his 11th year at Oregon State.
The Beavers won the Corvallis Regional and Super Regional to advanced to the College World Series, where they were defeated by the Baylor Bears.
! style="" | Regular season (41–9)|- valign="top" |-! colspan=14 style="padding-left:4em;background:#D63F09; color:#000000" | Bob Schaefer Memorial Tournament|- align="center" bgcolor="#ddffdd"| 1 || February 3 || vs. || || Packard Stadium • Tempe, Arizona || || 1–0 || –|- align="center" bgcolor="#ffdddd"| 2 || February 4 || vs. || || Packard Stadium • Tempe, Arizona || L 1–3 || 1–1 || –|- align="center" bgcolor="#ddffdd"| 3 || February 5 || vs. New Mexico State || || Packard Stadium • Tempe, Arizona || W 11–2 || 2–1 || –|- align="center" bgcolor="#ddffdd"| 4 || February 6 || || || Packard Stadium • Tempe, Arizona || || 3–1 || –|-! colspan=14 style="padding-left:4em;background:#D63F09; color:white" ||- align="center" bgcolor="#ddffdd"| 5 || || || || Goss Stadium at Coleman Field • Corvallis, Oregon || W 6–4 || 4–1 || –|-! colspan=14 style="padding-left:4em;background:#D63F09; color:#000000" | San Diego Tournament|- align="center" bgcolor="#ddffdd"| 6 || February 19 || vs. || || John Cunningham Stadium • San Diego, California || W 8–0 || 5–1 || –|- align="center" bgcolor="#ddffdd"| 7 || February 20 || at || || John Cunningham Stadium • San Diego, California || W 3–2 || 6–1 || –|-! colspan=14 style="padding-left:4em;background:#D63F09; color:white" ||- align="center" bgcolor="#ddffdd"| 8 || February 25 || at || || || W 4–2 || 7–1 || –|- align="center" bgcolor="#ddffdd"| 9 || February 26 || at UC Santa Barbara || || Caesar Uyesaka Stadium • Santa Barbara, California || W 6–4 || 8–1 || –|- align="center" bgcolor="#ddffdd"| 10 || February 27 || at UC Santa Barbara || || Caesar Uyesaka Stadium • Santa Barbara, California || W 5–3 || 9–1 || –|-|- align="center" bgcolor="#ffdddd"| 11 || March 4 || || No. 28 || Goss Stadium at Coleman Field • Corvallis, Oregon || L 2–3 || 9–2 || –|- align="center" bgcolor="#ddffdd"| 12 || March 5 || UC Riverside || No. 28 || Goss Stadium at Coleman Field • Corvallis, Oregon || W 5–2 || 10–2 || –|- align="center" bgcolor="#ddffdd"| 13 || March 6 || UC Riverside || No. 28 || Goss Stadium at Coleman Field • Corvallis, Oregon || W 7–2 || 11–2 || –|-! colspan=14 style="padding-left:4em;background:#D63F09; color:#000000" | Yellow Book USA Classic|- align="center" bgcolor="#ddffdd"| 14 || March 11 || vs. || No. 28 || Eddy D. Field Stadium • Malibu, California || W 4–1 || 12–2 || –|- align="center" bgcolor="#ffdddd"| 15 || March 12 || at || No. 28 || Eddy D. Field Stadium • Malibu, California || L 4–9 || 12–3 || –|- align="center" bgcolor="#ddffdd"| 16 || March 13 || vs. No. 30 || No. 28 || Eddy D. Field Stadium • Malibu, California || W 8–2 || 13–3 || –|-! colspan=14 style="padding-left:4em;background:#D63F09; color:white" ||- align="center" bgcolor="#ddffdd"| 17 || March 18 || || No. 30 || Goss Stadium at Coleman Field • Corvallis, Oregon || W 8–2 || 14–3 || –|- align="center" bgcolor="#ddffdd"| 18 || March 18 || Sacramento State || No. 30 || Goss Stadium at Coleman Field • Corvallis, Oregon || W 7–4 || 15–3 || –|- align="center" bgcolor="#ddffdd"| 19 || March 19 || Sacramento State || No. 30 || Goss Stadium at Coleman Field • Corvallis, Oregon || W 9–3 || 16–3 || –|- align="center" bgcolor="#ddffdd"| 20 || March 22 || at Portland || No. 28 || Joe Etzel Field • Portland, Oregon || W 9–3 || 17–3 || –|- align="center" bgcolor="#ffdddd"| 21 || March 24 || || No. 28 || Goss Stadium at Coleman Field • Corvallis, Oregon || L 7–17 || 17–4 || –|- align="center" bgcolor="#ddffdd"| 22 || March 25 || Dallas Baptist || No. 28 || Goss Stadium at Coleman Field • Corvallis, Oregon || W 7–2 || 18–4 || –|- align="center" bgcolor="#ddffdd"| 23 || March 25 || Dallas Baptist || No. 28 || Goss Stadium at Coleman Field • Corvallis, Oregon || W 11–3 || 19–4 || –|- align="center" bgcolor="#ddffdd"| 24 || March 28 || || No. 27 || Goss Stadium at Coleman Field • Corvallis, Oregon || W 12–5 || 20–4 || –|- align="center" bgcolor="#ddffdd"| 25 || March 29 || BYU || No. 27 || Goss Stadium at Coleman Field • Corvallis, Oregon || W 11–6 || 21–4 || –|-|- align="center" bgcolor="#ddffdd"| 26 || April 1 || || || Goss Stadium at Coleman Field • Corvallis, Oregon || W 11–1 || 22–4 || 1–0|- align="center" bgcolor="#ddffdd"| 27 || April 2 || California || No. 27 || Goss Stadium at Coleman Field • Corvallis, Oregon || W 5–2 || 23–4 || 2–0|- align="center" bgcolor="#ddffdd"| 28 || April 3 || California || No. 27 || Goss Stadium at Coleman Field • Corvallis, Oregon || W 4–2 || 24–4 || 3–0|- align="center" bgcolor="#ddffdd"| 29 || April 9 || at No. 12 || No. 15 || Sunken Diamond • Stanford, California || W 9–7 || 25–4 || 4–0|- align="center" bgcolor="#ddffdd"| 30 || April 9 || at No. 12 Stanford || No. 15 || Sunken Diamond • Stanford, California || || 26–4 || 5–0|- align="center" bgcolor="#ffdddd"| 31 || || at No. 12 Stanford || No. 15 || Sunken Diamond • Stanford, California || L 3–4 || 26–5 || 5–1|- align="center" bgcolor="#ffdddd"| 32 || April 15 || at No. 6 Arizona || No. 11 || || L 5–7 || 26–6 || 5–2|- align="center" bgcolor="#ddffdd"| 33 || April 16 || at No. 6 Arizona || No. 11 || Jerry Kindall Field at Frank Sancet Stadium • Tucson, Arizona || W 17–1 || 27–6 || 6–2|- align="center" bgcolor="#ffdddd"| 34 || April 17 || at No. 6 Arizona || No. 11 || Jerry Kindall Field at Frank Sancet Stadium • Tucson, Arizona || L 6–7 || 27–7 || 6–3|- align="center" bgcolor="#ddffdd"| 35 || April 22 || || No. 11 || Goss Stadium at Coleman Field • Corvallis, Oregon || W 5–4 || 28–7 || 7–3|- align="center" bgcolor="#ddffdd"| 36 || April 24 || Washington State || No. 11 || Goss Stadium at Coleman Field • Corvallis, Oregon || W 8–1 || 29–7 || 8–3|- align="center" bgcolor="#ddffdd"| 37 || April 24 || Washington State || No. 11 || Goss Stadium at Coleman Field • Corvallis, Oregon || W 7–6 || 30–7 || 9–3|- align="center" bgcolor="#ddffdd"| 38 || April 29 || || No. 9 || Goss Stadium at Coleman Field • Corvallis, Oregon || W 6–5 || 31–7 || 10–3|- align="center" bgcolor="#ffdddd"| 39 || April 30 || No. 17 Arizona State || No. 9 || Goss Stadium at Coleman Field • Corvallis, Oregon || L 1–3 || 31–8 || 10–4|-|- align="center" bgcolor="#ddffdd"| 40 || May 1 || No. 17 Arizona State || No. 9 || Goss Stadium at Coleman Field • Corvallis, Oregon || W 5–1 || 32–8 || 11–4|- align="center" bgcolor="#ddffdd"| 41 || May 3 || Portland || No. 9 || Goss Stadium at Coleman Field • Corvallis, Oregon || W 6–2 || 33–8 || 11–4|- align="center" bgcolor="#ddffdd"| 42 || May 6 || at || No. 9 || Jackie Robinson Stadium • Los Angeles, California || W 3–1 || 34–8 || 12–4|- align="center" bgcolor="#ddffdd"| 43 || May 7 || at UCLA || No. 9 || Jackie Robinson Stadium • Los Angeles, California || W 10–4 || 35–8 || 13–4|- align="center" bgcolor="#ddffdd"| 44 || May 8 || at UCLA || No. 9 || Jackie Robinson Stadium • Los Angeles, California || W 16–3 || 36–8 || 14–4|- align="center" bgcolor="#ddffdd"| 45 || May 13 || at || No. 8 || Husky Ballpark • Seattle, Washington || W 7–0 || 37–8 || 15–4|- align="center" bgcolor="#ddffdd"| 46 || May 14 || at Washington || No. 8 || Husky Ballpark • Seattle, Washington || W 7–4 || 38–8 || 16–4|- align="center" bgcolor="#ddffdd"| 47 || May 15 || at Washington || No. 8 || Husky Ballpark • Seattle, Washington || W 3–1 (10) || 39–8 || 17–4|- align="center" bgcolor="#ddffdd"| 48 || May 20 || No. 17 || No. 3 || Goss Stadium at Coleman Field • Corvallis, Oregon || W 5–4 || 40–8 || 18–4|- align="center" bgcolor="#ddffdd"| 49 || May 21 || No. 17 Southern California || No. 3 || Goss Stadium at Coleman Field • Corvallis, Oregon || W 10–7 || 41–8 || 19–4|- align="center" bgcolor="#ffdddd"| 50 || May 22 || No. 17 Southern California || No. 3 || Goss Stadium at Coleman Field • Corvallis, Oregon || L 2–12 || 41–9 || 19–5|-|-|-! style="" | Postseason (5–3)|- valign="top"|- align="center" bgcolor="#ddffdd"| 51 || June 3 || (4) || (1) No. 3 || Goss Stadium at Coleman Field • Corvallis, Oregon || W 4–3 || 42–9 || 1–0|- align="center" bgcolor="#ddffdd"| 52 || June 4 || (3) No. 29 || (1) No. 3 || Goss Stadium at Coleman Field • Corvallis, Oregon || W 11–1 || 43–9 || 2–0|- align="center" bgcolor="#ddffdd"| 53 || June 5 || (3) No. 29 St. John's || (1) No. 3 || Goss Stadium at Coleman Field • Corvallis, Oregon || W 19–3 || 44–9 || 3–0|-|- align="center" bgcolor="#ddffdd"| 54 || || || (8) No. 3 || || W 10–4 || 45–9 || 4–0|- align="center" bgcolor="#ffdddd"| 55 || June 12 || No. 16 Southern California || (8) No. 3 || Goss Stadium at Coleman Field • Corvallis, Oregon || || 45–10 || 4–1|- align="center" bgcolor="#ddffdd"| 56 || || No. 16 Southern California || (8) No. 3 || Goss Stadium at Coleman Field • Corvallis, Oregon || || 46–10 || 5–1|-|- align="center" bgcolor="#ffdddd"| 57 || June 18 || vs. (1) No. 1 || (8) No. 2 || Johnny Rosenblatt Stadium • Omaha, Nebraska || L 1–3 || 46–11 || 0–1|- align="center" bgcolor="#ffdddd"| 58 || June 20 || vs. (4) No. 4 Baylor || (8) No. 2 || Johnny Rosenblatt Stadium • Omaha, Nebraska || L 3–4 (10) || 46–12 || 0–2|-