The 2018 season was Hammarby Fotboll's 103rd in existence, their 49th season in Allsvenskan and their 4th consecutive season in the league. They competed in Allsvenskan and Svenska Cupen during the year. League play started in early April and lasted until early November. Stefan Billborn made his first season as manager.
In the off-season, on 4 January 2018, the board and Jesper Jansson, director of football, chose to sack manager Jakob Michelsen, citing differences regarding the view on transfers and playing style, as well as a disappointing development of the team and its results. Hammarby finished 9th in Allsvenskan 2017.
Kickoff times are in (UTC+01) unless stated otherwise.
Kickoff times are in .