Jim O'Neil (born October 26, 1978) is an American football coach who currently is the defensive assistant for the Detroit Lions. Previously he was the defensive coordinator at Northwestern University and as assistant coach in the NFL for the New York Jets, Buffalo Bills, Cleveland Browns, the San Francisco 49ers and Las Vegas Raiders.

Prior to the Raiders, O'Neil served as defensive coordinator for the San Francisco 49ers (2016) and the Cleveland Browns (2014-15). In 2016, O'Neil oversaw a 49ers' defense that improved 13 spots to finish 14th in the NFL in passing defense, allowing just 240.5 passing yards per game.

Jan 27, 2014 · The Browns announced the hiring of Jim O’Neil as defensive coordinator on Monday night. The 35-year-old O’Neil was the Bills’ linebackers coach in 2013, the Jets’ assistant secondary coach from 2010 through 2012 and the Jets’ …

Feb 21, 2024 · Most recently serving as the defensive coordinator at Northwestern (2021-22), O'Neil joins the Lions for his 12th season as an NFL coach after previously working for the Las Vegas Raiders (2019-20 – defensive backs; 2018 – senior defensive assistant), San Francisco 49ers (2016 – defensive coordinator), Cleveland Browns (2014-15 ...

Jim O'Neil was named Northwestern's defensive coordinator in February of 2021. O’Neil joins the Wildcats after spending three seasons with the National Football League’s Las Vegas Raiders, including the previous two as the defensive backs coach.

Jan 27, 2014 · CLEVELAND -- Browns coach Mike Pettine hired Jim O'Neil as his defensive coordinator on Monday, reuniting him with the coach who helped him turn around Buffalo's defense last season. Pettine...

Feb 21, 2024 · The Lions are making some changes on their defensive staff. One of the moves will be bringing former defensive coordinator Jim O’Neil back to the NFL. Out of the league since the 2020 season, O’Neil will return as a Detroit defensive assistant.

Jan 27, 2014 · The Cleveland Browns officially announced the hiring of Bills LB coach Jim O’Neil as their new defensive coordinator position. The Browns also announced the hiring of: O’Neil spent last season with new Browns HC Mike Pettine in Buffalo and dates back to Pettine’s time with the New York Jets.

Jan 27, 2016 · San Francisco 49ers coach Chip Kelly filled one of the vital positions on his staff Tuesday by naming Jim O’Neil as his defensive coordinator. O'Neil, whose hiring was confirmed by Mike...

Nov 29, 2022 · Per a statement released Tuesday afternoon, Northwestern football confirmed defensive coordinator Jim O’Neil will not be back with the Wildcats for the 2023 season. O’Neil will leave the...