Alexander Alexandrovich Efimkin (Russian: Александр Александрович Ефимкин; born 2 December 1981 in Kuybyshev) is a Russian former professional road bicycle racer, who competed professionally between 2006 and 2012 for the Barloworld, Quick-Step, Ag2r–La Mondiale and Team Type 1–Sanofi teams. Efimkin has also worked as the directeur sportif of the Russian Helicopters team in 2013, the RusVelo Women's Team in 2013 and the men's RusVelo team in 2014 and 2015.

The twin brother of Vladimir Efimkin, Alexander Efimkin burst on to the professional cycling scene in 2005 with a 2nd place overall at the Settimana Ciclistica Lombarda, a highly competitive race. Since that time he has proven a competent professional racer, with few victories to his name. In part this is owing to his service to the stars of his team, and in part due to his relatively young age.