The 1984 Detroit Lions season was their 55th in the National Football League.
The team failed to improve upon their previous season's output of 9–7, winning only four games.
In a season littered with numerous key injuries, the most painful was star running back Billy Sims suffering a career-ending knee injury in a game against the Minnesota Vikings.
In just five seasons in the NFL since joining Detroit in 1980, Sims had set the Lions career rushing mark at 5,106.
[2] Running backs (RB) Wide receivers (WR) Tight ends (TE) Defensive linemen (DL) Defensive backs (DB) Special teams Reserve