| Dan O'Sullivan | |
| Height Ft: | 6 |
| Height In: | 10 |
| Weight Lbs: | 250 |
| Birth Date: | 3 March 1968 |
| Birth Place: | The Bronx, New York |
| Nationality: | American / Irish |
| High School: | Bayonne (Bayonne, New Jersey) |
| College: | Fordham (1986–1990) |
| Draft Year: | 1990 |
| Career Start: | 1990 |
| Career End: | 2000 |
| Career Position: | Center |
| Career Number: | 45, 54, 53, 52 |
| Years1: | 1990 |
| Team1: | Omaha Racers |
| Team2: | Utah Jazz |
| Years3: | 1991–1992 |
| Team3: | Louisville Shooters |
| Years4: | 1992 |
| Team4: | New Jersey Jammers |
| Years7: | 1993 |
| Team7: | Gallitos de Isabela |
| Years9: | 1994–1995 |
| Team9: | Rapid City Thrillers |
| Years10: | 1995 |
| Team10: | Jersey Turnpikes |
| Years11: | 1995 |
| Team11: | Jackson Jackals |
| Years12: | 1995 |
| Team12: | TAU Cerámica |
| Years13: | 1995–1995 |
| Team13: | Shreveport Storm |
| Team14: | Toronto Raptors |
| Years15: | 1996 |
| Team15: | Pesaro |
| Years16: | 1997–1998 |
| Team16: | Fortitudo Bologna |
| Years17: | 1998–1999 |
| Team17: | Virtus Bologna |
| Years18: | 1999–2000 |
| Team18: | AEK Athens |
| Bbr: | osullda01 |
Daniel James O'Sullivan (born March 3, 1968) is an American former professional basketball player.
A 6′10″ (2.08 m), 250 lb (114 kg) center born in The Bronx, New York, O'Sullivan attended Fordham University. He played with the Omaha Racers of the Continental Basketball Association,[1] and from the 1990–91 NBA season until 1996, he played with five different NBA teams: Utah Jazz (1990–91), New Jersey Nets (1992–93),[2] Milwaukee Bucks (1992–93), Detroit Pistons (1993–94) and Toronto Raptors (1995–96). He has played for Washington Bullets during the 1993 pre-season (but not in the regular season). He also played with Kinder Bologna, Teamsystem Bologna and Scavolini in the Italian league, and also in Greece for AEK (1999–2000).
|-| align="left" | 1990–91| align="left" | Utah| 21 || 0 || 4.0 || .438 || .000 || .636 || 0.8 || 0.2 || 0.0 || 0.0 || 1.0|-| align="left" | 1992–93| align="left" | New Jersey| 3 || 0 || 3.3 || .667 || .000 || .000 || 1.3 || 0.0 || 0.0 || 0.0 || 1.3|-| align="left" | 1992–93| align="left" | Milwaukee| 3 || 0 || 2.3 || .500 || .000 || .750 || 0.7 || 0.3 || 0.3 || 0.0 || 1.7|-| align="left" | 1993–94| align="left" | Detroit| 13 || 0 || 4.3 || .333 || .000 || .750 || 0.8 || 0.2 || 0.0 || 0.0 || 1.3|-| align="left" | 1995–96| align="left" | Toronto| 5 || 2 || 27.8 || .371 || .000 || .875 || 6.4 || 0.4 || 0.4 || 0.8 || 6.6|- class="sortbottom"| style="text-align:center;" colspan="2"| Career| 45 || 2 || 6.6 || .397 || .000 || .743 || 1.4 || 0.2 || 0.1 || 0.1 || 1.8|}
|-| align="left" | 1986–87| align="left" | Fordham| 18 || - || 6.2 || .524 || - || .462 || 1.4 || 0.1 || - || - || 1.6|-| align="left" | 1987–88| align="left" | Fordham| 33 || - || 28.5 || .568 || - || .667 || 5.8 || 0.7 || - || - || 9.8|-| align="left" | 1988–89| align="left" | Fordham| 29 || - || 30.9 || .454 || .000 || .686 || 7.4 || 1.4 || - || - || 10.8|-| align="left" | 1989–90| align="left" | Fordham| 33 || - || 32.2 || .489 || .000 || .578 || 7.5 || 2.0 || - || - || 12.5|- class="sortbottom"| style="text-align:center;" colspan="2"| Career| 113 || - || 26.6 || .501 || .000 || .634 || 6.0 || 1.2 || - || - || 9.5|}