The five-time world champion kicked off second, but in the course of the race he managed to beat his partner Finn Valtteri Bottas, who won the qualification, but finished after Hamilton. The Briton also won an extra point for the fastest lap of the race.
Three closed the Dutch pilot Red Bull Max Verstappen.
Russian Toro Rosso driver Daniil Kvyat finished the race in ninth position.
Confirmation of another 1-2 for @ MercedesAMGF1
That's the finest record for consecutive 1-2 finishes F1 # F1 # SpanishGP. Pic.twitter.com/ceP72v8LlR
Earlier it was reported that Sergey Sirotkin became a test pilot of Renault for testing new tires.