| Jim Heacock | |
| Birth Date: | 23 June 1948 |
| Birth Place: | Alliance, Ohio, U.S. |
| Player Years1: | 1967–1970 |
| Player Team1: | Muskingum |
| Coach Years1: | 1971 |
| Coach Team1: | Marlington HS (OH) (assistant) |
| Coach Years2: | 1972 |
| Coach Team2: | Bowling Green (GA) |
| Coach Years3: | 1973–1974 |
| Coach Team3: | Muskingum (DB) |
| Coach Years4: | 1975–1977 |
| Coach Team4: | Muskingum (DC) |
| Coach Years5: | 1978–1980 |
| Coach Team5: | Bowling Green (DL) |
| Coach Years6: | 1981–1982 |
| Coach Team6: | Bowling Green (AHC/DC) |
| Coach Years7: | 1983–1987 |
| Coach Team7: | Washington (DL) |
| Coach Years8: | 1988–1995 |
| Coach Team8: | Illinois State |
| Coach Years9: | 1996–2004 |
| Coach Team9: | Ohio State (DL) |
| Coach Years10: | 2005–2011 |
| Coach Team10: | Ohio State (DC) |
| Overall Record: | 37–49–2 |
| Championships: | National Championship, 2001 |
| Awards: | Broyles Award (2007) |
Jim Heacock (born June 23, 1948) is a former American football coach. He served as the head football coach at Illinois State University from 1988 to 1995, compiling a record of 37–49–2. In 1996, he became an assistant coach at Ohio State University and served as the defensive coordinator for the Ohio State Buckeyes from 2005 until his retirement following the 2011 season.
Heacock was an assistant coach at the University of Washington from 1983 to 1987. As the team prepared for its bowl game in 1987, Heacock accepted a job as the head football coach at Illinois State University. At Illinois State, he employed future Ohio State head coach Urban Meyer.
In 1996, Heacock joined Ohio State University's football coaching staff as the defensive line coach. When head coach John Cooper was fired in 2001, Heacock was one of only three assistants retained by the new head coach, Jim Tressel. Heacock won the Broyles Award, awarded to the nation's top assistant coach, in 2007. As of 2008, Heacock was the most senior member of the Ohio State coaching staff. Heacock was promoted to defensive coordinator in 2005. In his first year in that position, the Ohio State defense was ranked first in the nation in rush defense. The same year, the defense ranked fifth in the nation for fewest points allowed and for total defense. According to sportswriter Dennis Dodd, "Statistically, the 2007 unit was among the best finishing first nationally in scoring defense, total defense and pass defense".
Heacock was awarded the Broyles Award in 2007 as the top assistant coach in college football. Tressel remarked that "Heacock's defense has allowed this young Ohio State team to become a national contender." Heacock was more modest, claiming that "We're all just in this for the same reason. ... There are other assistants who do every bit as much as I do. I kind of get in the way."