| Team: | Detroit Lions |
| Year: | 1966 |
| Record: | 4–9–1 |
| Division Place: | 6th NFL Western |
| Coach: | Harry Gilmer |
| Stadium: | Tiger Stadium |
| Radio: | WWJ |
| Playoffs: | Did not qualify |
| Shortnavlink: | Lions seasons |
| Pro Bowlers: | Dick LeBeau, Roger Brown, Pat Studstill |
| Ap All-Pros: | Pat Studstill |
The Detroit Lions season was their 37th in the league. The team failed to improve on their previous season's output of 6–7–1, winning only four games.[1] They missed the playoffs for the ninth straight season and incurred their second losing record in a row.
| Week | Date | Opponent | Result | Record | Attendance |
|---|---|---|---|---|---|
| 1 | September 11 | Chicago Bears | W 14–3 | 1–0 | 52,225 |
| 2 | September 18 | at Pittsburgh Steelers | L 3–17 | 1–1 | 35,473 |
| 3 | September 25 | Atlanta Falcons | W 28–10 | 2–1 | 47,615 |
| 4 | October 2 | at Green Bay Packers | L 14–23 | 2–2 | 50,861 |
| 5 | October 9 | Los Angeles Rams | L 7–14 | 2–3 | 52,793 |
| 6 | October 16 | at Baltimore Colts | L 14–45 | 2–4 | 60,238 |
| 7 | October 23 | L 24–27 | 2–5 | 36,745 | |
| 8 | October 30 | Green Bay Packers | L 7–31 | 2–6 | 56,954 |
| 9 | November 6 | at Chicago Bears | T 10–10 | 2–6–1 | 47,041 |
| 10 | November 13 | at Minnesota Vikings | W 32–31 | 3–6–1 | 43,939 |
| 11 | November 20 | Baltimore Colts | W 20–14 | 4–6–1 | 52,383 |
| 12 | November 24 | San Francisco 49ers | L 14–41 | 4–7–1 | 53,189 |
| 13 | December 4 | at Los Angeles Rams | L 3–23 | 4–8–1 | 40,039 |
| 14 | December 11 | L 16–28 | 4–9–1 | 43,022 | |
| 15 | Bye |