The 1984 New York Cosmos season was the fourteenth season for the New York Cosmos playing in the now-defunct North American Soccer League.

During the 1984 season, the Cosmos finished in third place in the Eastern Division, failing to qualify for the playoffs for the first time since 1975.

It was also the first season since 1978 that the Cosmos failed to finish first in the overall league table, ending a streak of six premierships.

Note: Flags indicate national team as defined under FIFA eligibility rules; some limited exceptions apply.

After poor attendances and lack of media interest, the club shut down operations upon playing a handful of friendly matches.