The 1977Baltimore Coltsseason was the 25th season for the team in the National Football League (NFL). The Colts finished the NFL's 1977 season with a record of 10 wins and 4 losses, and tied for first in the AFCEast division with the Miami Dolphins. However, the Colts finished ahead of Miami based on better conference record (9–3 to Dolphins' 8–4). This season would mark the final season in which the Colts would make the playoffs as a Baltimore-based franchise (the Colts next appearance in the playoffs came 10 years later in 1987, by which time the team moved to Indianapolis). Baltimore would not have a team in the playoffs again until the Baltimore Ravens advanced to Super Bowl XXXV, just over 23 years later.
The team made it to the playoffs as a No. 2 seed and played host to the Oakland Raiders in the divisional round. The Colts held a 31–28 lead with time running out, when the famous "Ghost to the Post" play to Casper advanced the Raiders to the Baltimore 14-yard line, where Errol Mann kicked the tying field goal to send the contest into overtime. After the first overtime went scoreless, Casper caught a 10-yard touchdown pass 43 seconds into the period to win the game for the Raiders.