| Billy O'Conner | |
| Current Title: | Head coach |
| Current Team: | Xavier |
| Current Conference: | Big East |
| Current Record: | 182–171 |
| Birth Date: | 2 January 1987 |
| Birth Place: | Cincinnati, Ohio, U.S. |
| Player Years1: | 2006–2007 |
| Player Team1: | Indiana |
| Player Years2: | 2008–2009 |
| Player Team2: | Xavier |
| Player Years3: | 2009 |
| Player Team3: | Arizona League Rangers |
| Player Years4: | 2009 |
| Player Team4: | Spokane Indians |
| Player Years5: | 2010 |
| Player Team5: | Washington Wild Things |
| Player Positions: | Catcher |
| Coach Years1: | 2011–2012 |
| Coach Team1: | Xavier (vol. asst.) |
| Coach Years2: | 2013 |
| Coach Team2: | Northern Kentucky (vol. asst.) |
| Coach Years3: | 2014–2017 |
| Coach Team3: | Xavier (asst.) |
| Coach Years4: | 2018–present |
| Coach Team4: | Xavier |
| Overall Record: | 182–171 |
| Tournament Record: | Big East: 10–9 NCAA: 2–2 |
| Championships: | Big East Conference Tournament (2023) |
William O'Conner Jr. (born January 2, 1987) is an American college baseball coach and former catcher. O'Conner is the head coach of the Xavier Musketeers baseball team. O'Conner played college baseball at the Indiana University for coach Tracy Smith before transferring to the Xavier University to play for coach Scott Googins from 2008 to 2009.
O'Conner attended Elder High School in Cincinnati, Ohio. O'Conner then enrolled at the Indiana University, to play college baseball for the Indiana Hoosiers baseball team.
As a freshman at the Indiana University in 2006, O'Conner had a .176 batting average, a .233 on-base percentage (OBP) and a .206 SLG.
As a sophomore in 2007, O'Conner batted .310 with a .310 SLG, 9 hits, and 9 RBIs.
In the 2008 season as a junior, O'Conner transferred to the Xavier University to play for the Xavier Musketeers baseball team and hit 5 doubles and 21 RBIs.
O'Conner had his best season as a senior in 2009, with home runs (2) and was a key contribute with RBIs (39), batting average (.333) and slugging (.412). He was named Honorable mention All-Atlantic 10 Conference baseball tournament Team.[1]
O'Conner joined the Xavier coaching staff as a volunteer coach in 2011. He stayed with the Musketeers through the 2012 season. O'Conner joined the Northern Kentucky Norse baseball staff as a volunteer coach in 2013.[2] He re-joined the Xavier staff in 2013 as a full-time assistant. O'Conner spent 4 seasons as an assistant for the Xavier baseball staff.
In June 2017, O'Conner was named the head coach of the Musketeers program.[3] O'Conner lead the Musketeers to a 21–35 finish in his first season.