The Redskins marched straight down the field to add to their lead on the first drive of the second half. Alfred Morris rushed in for a 10-yard score to put the Redskins ahead, 20-10, and record his 10th touchdown of the season.
Philadelphia responded with a 30-yard field goal by Alex Henery to close the gap to seven points with just over eight minutes left in the quarter.
After missing last week with a knee injury sustained in Week 14, Griffin III has completed 12 of 19 passes for 169 yards and two touchdowns.
The game is being televised on FOX.