The 1978 Baltimore Colts season was the 26th season for the team in the National Football League (NFL). Under fourth-year head coach Ted Marchibroda, the Colts finished with 5 wins and 11 losses, tied for fourth in the AFC East division with the Buffalo Bills. Baltimore lost the tiebreaker to Buffalo based on head-to-head series (0–2). This was the first time under Marchibroda that Baltimore did not make the postseason.