DB9
DB9 or DB-9 may refer to:

Aston Martin DB9, a British sports car
Atari joystick port, DB9 classic video game controller port made popular for game consoles and home computers  mainly through the 1980s and ‘90s
Darren Bent, English football forward who wears the number 9 shirt for Aston Villa F.C.
DB9 (yacht), a superyacht built by Palmer Johnson in 2010
DE-9 connector, a common type of D-subminiature electrical connector.
Dimitar Berbatov, Bulgarian footballer who plays as a forward for Fulham F.C. wearing a number 9 shirt