| Bill Mosiello | |
| Current Title: | Assistant/hitting coach |
| Current Team: | TCU |
| Current Conference: | Big 12 Conference |
| Birth Date: | 14 July 1964 |
| Birth Place: | Sacramento, California, U.S. |
| Alma Mater: | Fresno State University |
| Player Years1: | 1983, 1986 |
| Player Team1: | Fresno State |
| Player Years2: | 1984–1985 |
| Player Team2: | Cerritos College |
| Player Positions: | Catcher |
| Coach Years1: | 1987–1990 |
| Coach Team1: | Cerritos College (H) |
| Coach Years2: | 1991–1992 |
| Coach Team2: | Cal State Fullerton (H) |
| Coach Years3: | 1993–1994 |
| Coach Team3: | Tennessee (H) |
| Coach Years4: | 1995 |
| Coach Team4: | Ole Miss (P) |
| Coach Years5: | 1996–2001 |
| Coach Team5: | Oklahoma (H/IF/AHC) |
| Coach Years6: | 2001 |
| Coach Team6: | Arizona State (H) |
| Coach Years7: | 2002–2003 |
| Coach Team7: | Trenton Thunder (H) |
| Coach Years8: | 2004 |
| Coach Team8: | Battle Creek Yankees (H/Interim) |
| Coach Years9: | 2005–2006 |
| Coach Team9: | Charleston RiverDogs |
| Coach Years10: | 2007 |
| Coach Team10: | USC (H) |
| Coach Years11: | 2008 |
| Coach Team11: | Auburn (H) |
| Coach Years12: | 2009–2010 |
| Coach Team12: | Cedar Rapids Kernels |
| Coach Years13: | 2011 |
| Coach Team13: | Arkansas Travelers |
| Coach Years14: | 2012–2013 |
| Coach Team14: | Tennessee (H) |
| Coach Years15: | 2014–2022 |
| Coach Team15: | TCU (H/AHC) |
| Coach Years16: | 2023–2024 |
| Coach Team16: | Ohio State |
| Coach Years17: | 2025–present |
| Coach Team17: | TCU (H/AHC) |
William Mosiello (born July 14, 1964) is an American baseball coach and former catcher, who is a current assistant baseball coach for the TCU Horned Frogs and former head coach for the Ohio State Buckeyes. He played college baseball at Cerritos College from 1984 to 1985 before transferring to Fresno State where he played in 1986.
Mosiello went to Cerritos High School in Cerritos, California, where he played catcher. Mosiello redshirted the 1983 season at Fresno State. He then transferred and played at Cerritos College.[1] As a Freshman, Mosiello was named the most inspirational player for the Falcons.[2] He was named second team All-South Coast Conference as a sophomore. Mosiello then returned to Fresno State, where he lettered in 1986.[3]
Mosiello began his coaching career in 1987, returning to Cerritos as their hitting coach. He would join the staff at Cal State Fullerton from 1991 to 1992. 1993, saw him take the hitting coach position with the Tennessee Volunteers. Mosiello skippered the Brewster Whitecaps, a collegiate summer baseball team in the Cape Cod Baseball League, in 1994 and from 1996 to 1999, and was named the league's manager of the year in 1998.[4] [5] [6]
While an assistant coach at Oklahoma, Mosiello abruptly quit 23 games into the 2001 season after being told to temper his intensity.[7]
In 2004, Mosiello was manager of the Battle Creek Yankees. The Yankees moved him to the Charleston RiverDogs in 2005, where the RiverDogs best first half record allowed him to manage the South Atlantic League's South Division All Stars.[8]
Mosiello joined Chad Kreuter's staff as the hitting coach of the USC Trojans in 2007.[9] After a single season, he left the Trojans to join the Auburn Tigers.[10]
While managing the Arkansas Travelers during the 2011 season, Mosiello abruptly resigned[11] to return to the college game, as well as Tennessee in 2011, as the team's hitting coach.[12]
In the summer of 2013, Mosiello joined Jim Schlossnagle's staff at TCU.[13] His longest coaching stay came at TCU, where he helped lead the Horned Frogs to seven NCAA tournaments and four College World Series from 2014 to 2022.
On June 16, 2022, Mosiello was named the head coach at Ohio State, his first head coaching position at the Division I level in his lengthy coaching career.[14]
Mosiello and his wife, Janelle, have three sons: Shane, Gehrig and Helton.