The 2005 Bahrain GP2 Series round was a GP2 Series motor race held on September 29 and 30, 2005 at the Bahrain International Circuit in Sakhir, Bahrain.

It was the final showdown of the 2005 GP2 Series season.

The race weekend was a stand-alone event unlike the previous GP2 rounds which support Formula One Grands Prix.

Coming into the final round of the season, Nico Rosberg held a five-point lead in the driver's championship from Heikki Kovalainen with 22 points up for grabs in the final round at the Bahrain International Circuit.