All-Time Roster
The following players have appeared in the Arizona Fall League since the league was established in 1992. The listed organization was the one the player was with when he played in the AFL.
O
| Player | Organization / AFL Team / Year |
|---|---|
| Oaks, Trevor | Royals Surprise 2019 |
| Obenchain, Steve | Athletics Phoenix 2004 |
| Obermueller, Wes | Royals Scottsdale 2002 |
| Oberste, Matt | Mets Scottsdale 2016 |
| O'Brien, Chris | Dodgers Glendale 2013 |
| O'Brien, Peter | Yankees Scottsdale 2013 / D-backs Salt River 2014 |
| Ochinko, Sean | Blue Jays Salt River 2012 / Mesa 2014 |
| Ochoa, Alex | Orioles Scottsdale 1994 |
| Ockimey, Josh | Red Sox Mesa 2018 |
| O'Conner, Justin | Rays Peoria 2014 |
| O'Connor, Brian | Pirates Mesa 1999 |
| O'Day, Darren | Angels Surprise 2007 |
| O'Donoghue, John | Orioles Scottsdale 1992; Tucson 1993 |
| O'Dowd, Chris | Rockies Salt River 2014 |
| Ogans, Keshawn | Braves Salt River 2023 |
| Ogden, Jamie | Twins Peoria 1995; Scottsdale 1996 |
| Odom, Joseph | Braves Peoria 2015 |
| O'Grady, Brian | Reds Peoria 2016 |
| O'Grady, Chris | Angels Mesa 2014 |
| O'Grady, Dennis | Padres Peoria 2013 |
| O'Hearn, Ryan | Royals Surprise 2016 |
| O'Hoppe, Logan | Phillies Peoria 2021 |
| Ohlendorf, Ross | Yankees Peoria Jav 2007 |
| Ohlman, Michael | Orioles Surprise 2013 / Glendale 2014 / Cardinals Surprise 2015 |
| Ohman, Will | Cubs Mesa 2000 |
| Ohme, Kevin | Twins Peoria 1995 |
| Ojeda, Augie | Orioles Phoenix 1997 |
| Okert, Steven | Giants Scottsdale 2014 |
| Olacio, Jefferson | White Sox Glendale 2014 |
| Olczak, Jon | Brewers Peoria 2018 |
| Olds, Wyatt | Red Sox Glendale 2023 |
| Oliva, Jared | Pirates Peoria 2019 |
| Oliver, Andrew | Tigers Peo Jav 2009; Salt River 2011 |
| Oliver, Darren | Rangers Tucson 1993 |
| Olivo, Miguel | White Sox Mesa 2001 |
| Olmos, Edgar | Marlins Glendale 2013 / Salt River 2014 |
| Olsen, Jason | White Sox Mesa 1997 |
| Olsen, Jon | Twins Glendale 2022 |
| Olsen, Kevin | Marlins Mesa 2001 |
| Olson, J.B. | White Sox Glendale 2021 |
| Olson, Matt | Athletics Mesa 2014 |
| Olson, Tim | D-backs Scottsdale 2001, 2002 |
| Olt, Michael | Rangers Surprise 2011 |
| O'Malley, Paul | Astros Maryvale 1998 |
| O'Malley, Shawn | Rays Phoenix 2009 |
| Ondrusek, Logan | Reds Peoria Sag 2009 |
| O'Neill, Michael | Rangers Surprise 2017 |
| O'Neill, Mike | Cardinals Surprise 2012 |
| O'Neill, Tyler | Mariners Peoria 2015-16 / Cardinals Salt River 2022 |
| Oquist, Mike | Orioles Tucson 1993 |
| Orenduff, Justin | Dodgers Peoria Sag 2007; Surprise 2008 |
| Orewiler, Austin | Reds Scottsdale 2018 |
| Orf, Nate | Brewers Surprise 2015 |
| Ori, Mark | Astros Scottsdale 2008 |
| Orie, Kevin | Cubs Phoenix 1996 |
| Ormond, Rodney | Orioles Maryvale 2002; Mesa SS 2003 |
| Ornelas, Tirso | Padres Peoria 2022 |
| Oropesa, Ricky | Giants Scottsdale 2012 |
| Orta, Ricky | Mariners Peoria Jav 2007 |
| Ortega, Bill | Cardinals Phoenix 2001 |
| Ortega, Jorge | Brewers Salt River 2017 |
| Ortiz, Abimelec | Rangers Surprise 2023 |
| Ortiz, Jhailyn | Phillies Surprise 2022 |
| Ortiz, Luis | Rangers Surprise 2015 |
| Ortiz, Ray | Twins Phoenix 1992 |
| Ortiz, Ryan | Athletics Phoenix 2011 |
| Ortiz, Santos | Athletics Peoria 1998 |
| Ortmeier, Dan | Giants Mesa 2005; Scottsdale 2007 |
| Osborn, Pat | Indians Mesa 2005 |
| Osborne, Mark | D-backs Grand Canyon 1997 |
| Osik, Keith | Pirates Phoenix 1992; Sun Cities 1993 |
| O'Sullivan, Ryan | Phillies Scottsdale 2014 |
| Osuna, Alejandro | Rangers Surprise 2023 |
| Osuna, Roberto | Blue Jays Mesa 2014 |
| Oswalt, Corey | Mets Scottsdale 2016 |
| Ottavino, Adam | Cardinals Peoria Sag 2008 |
| Otto, Glenn | Yankees Surprise 2019 |
| Outlaw, Mark | Phillies Grand Canyon 2001 |
| Outman, James | Dodgers Glendale 2021 |
| Outman, Josh | Phillies Peoria Sag 2007, USA 2007 |
| Overbay, Lyle | D-backs Scottsdale 2000 |
| Overbeck, Cody | Phillies Scottsdale 2011 |
| Overholt, Patrick | Phillies Peoria Sag 2007; Mesa 2008 |
| Owens, Billy | Orioles Scottsdale 1995 |
| Owens, Eric | Reds Peoria 1994 |
| Owens, Henry | Red Sox Peoria 2017 |
| Owens, Jeremy S. | Padres Peoria 2000 / Red Sox Mesa DD 2003 |
| Owens, Jerry L. | Expos Peoria Jav 2004 / White Sox Scottsdale 2006 |
| Owens, Ryan | Rockies Mesa 2001 |
| Owings, Chris | Diamondbacks Salt River 2012 |
| Oxspring, Chris | Padres Peoria Jav 2004 |