O'Neil Bell has four losses against four opponents on his boxing record. For a list of Bell's best fights, refer to "Best fights of O'Neil Bell".
On June 4, 2011 O'Neil Bell faced off against Richard Hall at age 36. He was coming in with a record of 26-4-1 (24), and Hall was 39 years old and with a record of 29-8 (27). Bell lost the fight via 2nd-round TKO.
On April 19, 2008 O'Neil Bell faced off against Tomasz Adamek at age 33. He was coming in with a record of 26-3-1 (24), and Adamek was 31 years old and with a record of 33-1 (22). Bell lost the fight via 8th-round TKO.
On March 17, 2007 O'Neil Bell met Jean-Marc Mormeck in a cruiserweight (WBA (Unified), WBC, The Ring) world-title defense fight. Bell was 32 years old and with a record of 26-2-1 (24), and Mormeck was 34 years old and with a record of 32-3 (22). Bell lost the fight via 12-round unanimous decision and lost the titles.
On April 11, 1998 O'Neil Bell faced off against Mahamed Benguesmia at age 23. He was coming in with a record of 1-1 (1). Bell lost the fight via 4th-round KO.