The 2017 Arena Football League season was the 30th season in the history of the Arena Football League (AFL). Prior to the start of the season, the league contracted to five teams. Due to this, for the first time since 1991, the league was not divided into conferences or divisions. The 14-game regular season began on April 7, 2017, when the two new teams, the Baltimore Brigade and the Washington Valor, faced off in the Verizon Center, and ended on August 5, 2017, when the Tampa Bay Storm lost against the Philadelphia Soul.

The Arena Football League (AFL) can refer to one of three successive professional indoor American football leagues in the United States. The first of these was founded in 1986, and played its first official games in the 1987 season, running for 22 consecutive seasons until going bankrupt following the 2008 season. The second league, consisting largely of teams from the first AFL and arenafootball2, purchased the first league's assets out of bankruptcy and resumed play in 2010 as a continuation of the first AFL; this second AFL ran for ten further seasons, before again going bankrupt following the 2019 season. The third and current AFL, which is not directly connected to the previous two iterations of the league but claiming their histories and trademarks, launched in 2024.