Gabriel, a 6-foot-8 forward from Charlotte, N.C., averaged 20.0 points and 9.0 rebounds in Auburn's wins against Ole Miss and LSU last week.
He shared the award with Mississippi State's Ravern Johnson.
Gabriel, a junior, scored a career-high 24 points against Ole Miss to help the Tigers erase a 20-point deficit. He got his first career double-double against an SEC team at LSU, finishing with 16 points and 11 rebounds.
He is the first Auburn player to be named SEC Player of the Week since March 9, 2009, when Korvotney Barber took the honor.
Gabriel is averaging 10.4 points and 5.9 rebounds this season.