The Cook County Sheriff is the sheriff of Cook County, Illinois, heading the Cook County Sheriff's Office.
Terms are currently four-years in length.
|- | colspan=21 style="text-align:center;" |Cook County Sheriff general elections |- !Year !Winning candidate !Party !Vote (pct) !Opponent !Party ! Vote (pct) !Opponent !Party ! Vote (pct) !Opponent !Party ! Vote (pct) !Opponent !Party ! Vote (pct) !Opponent !Party ! Vote (pct) |- | 1832<br/>...<br/>1898 | colspan=18 | |- |1902 | | Thomas E. Barrett | | Democratic | | 141,822 ( %) | | Daniel D. Healy | | Republican | | 135,036 ( %) | | James P. Larsen | | Social Democratic | | 13,134 ( %) | | Henry Sale | | Socialist Labor | | 5,973 ( %) || Joseph P. Tracy || Prohibition || 4,480 (1.32%) | Thomas Donegan | Single Tax | 908 ( %) |- |1906 | | Christopher Strassheim | | Republican | | 131,608 ( %) | | Harry J. Gibbons | | Democratic | | 93,836 ( %) | James J. Gray | Independent League | 49,296 ( %) | | 26,055 | | Socialist | | 26,055 ( %) || S. A. Wilson || Prohibition || 3,735 (%) | John Fitzpatrick | Progressive Alliance | 1,400 ( %) |- |1910 | | Michael Zimmer | | Democratic | | 165,445 ( %) | | Frank A. Volger | | Republican | | 145,598 | | William Van Bodegraven | | Socialist | | 27,588 ( %) || O. F. Sarber || Prohibition || 5,038 (%) | | | | | | |- |1914 | | John E. Traeger | | Democratic | | 166,335 ( %) | | George K. Schmidt | | Republican | | 112,502 | | Frederick S. Oliver | | Progressive | | 50,117 ( %) | | Bernard McMahon | | Socialist | | 23,319 ( %) || George W. Hoover || Prohibition || 1,229 (%) | | | |- |1918 | | Charles W. Peters | | Republican | | 177,912 ( %) | | Anton Cermak | | Democratic | | 174,829 (%) | | Adolf Dreifuss | | Socialist | | 19,572 ( %) | | | | | | | | | |- | 1922<br/>...<br/>1982 | colspan=18 | |- |1986 | | James E. O'Grady | | Democratic | | 706,659 (51.12%) | | Richard J. Elrod | | Democratic | | 673,233 (48.79%) | | | | | | |- |1990 | | Michael F. Sheahan | | Democratic | | 719,489 (55.41%) | | James E. O'Grady | | Republican | | 369,631 (28.47%) |Text style="background:#D2B48C | Tommy Brewer |Text style="background:#D2B48C | Harold Washington Party |Text style="background:#D2B48C | 191,101 (14.72%) |Text style="background:#008000 | William M. Piechuch, Sr. |Text style="background:#008000 | Illinois Solidarity |Text style="background:#008000 | 18,318 (1.41%) |- |1994 | | Michael F. Sheahan | | Democratic | | | | John D. Tourtelot | | Republican | | |Text style="background:#D2B48C | William A. Brown |Text style="background:#D2B48C | Harold Washington Party |Text style="background:#D2B48C | | William J. Benson | Populist | |- |1998 | | Michael F. Sheahan | | Democratic | | 903,053 (71.11%) | | LeRoy Martin | | Republican | | 366,867 (28.89%) | | | | | | |- |2002 | | Michael F. Sheahan | | Democratic | | 984,348 (76.88%) | | Ronald Swick | | Republican | | 296,062 (23.12%) | | | | | | |- |2006 | | Tom Dart | | Democratic | | 942,113 (74.70%) | | Peter Garza | | Republican | | 319,011 (25.30%) | | | | | | |- |2010 | | Tom Dart | | Democratic | | 1,041,696 (77.26%) | | Frederick Collins | | Republican | | 257,682 (19.11%) | | Marshall P. Lewis | | Green | | 48,930 (3.63%) | | | |- |2014 | | Tom Dart | | Democratic | | 1,055,783 (100%) | | | | | | | | | |- |2018 | | Tom Dart | | Democratic | | 1,455,825 (100%) | | | | | | | | | |- |2022 | |Tom Dart | | Democratic | |1,041,525 (74.21%) | | Lupe Aguirre | | Republican | | 321,252 (22.89%) | | Brad Sandefur | | Libertarian | | 40,752 (2.90%) | | |