The Baltimore Mariners are an indoor football team based in Baltimore, Maryland. The team is now a member of American Indoor Football. The team was founded when the American Indoor Football Association expelled the Baltimore Blackbirds for negotiating with another league. The AIFA maintained the lease rights to 1st Mariner Arena, so the Mariners were the league's replacement. On September 3, 2010, team owner Dwayne Wells was arrested on charges of wire fraud from an engineering firm he partially owned, allegedly using embezzled money from the firm to buy stakes in the Mariners franchise. Wells forfeited his ownership of the team, causing the Mariners to fold after the 2010 season. The Southern Indoor Football League, as successor to the eastern half of the AIFA, held the lease on the arena, now called Baltimore Arena, until it folded in 2011.
On March 21, 2010, the Mariners became the first team in AIFA history to earn a shutout win, as they won over the Fayetteville Guard 59-0.
On April 24, 2010, Baltimore continued its record-setting performances during a 91-19 home win over the Guard. They would set the team record for most points in one half and the most points in one game.