Mercedes boss Toto Wolff says he is proud of the efforts of his squad as it collected its seventh 1-2 finish from 11 races in 2015.
Lewis Hamilton cruised to victory while Nico Rosberg recovered from a poor start to take second, as the pair finished half a minute ahead of third-placed Romain Grosjean.
"I'm very proud of the team after today's result - and especially to get a 1-2 finish at Spa, which is such a difficult and demanding circuit to master," he said.
"Lewis did a perfect job - he got off the line well, defended cleanly his position from [Sergio] Perez up the hill and then drove a beautifully controlled race.
"He had the pace when he needed it, coped comfortably with all the challenges during the afternoon and scored a really impressive win.
"Nico obviously was hampered after his start, which we need to analyse, but then worked his way calmly back through the field.
"He kept Lewis honest all the way but couldn't quite close the gap. We will savour this win but need to keep our heads down and carry on working hard for Monza