In attempting to avoid eventual race-winner Esteban Ocon in his Alpine, Stroll hit Leclerc in his Ferrari at the apex of turn one.
The damage caused forced both drivers out of the race, while also affecting Daniel Ricciardo in his McLaren who was spun around and could only finish 12th by the chequered flag.
Like Bottas, the stewards have also hit Stroll with a five-place penalty for the Belgian Grand Prix at the end of August, as well as handing him two penalty points on his licence. The Canadian is now up to sixth in the last 12 months.
The stewards noted: "Immediately after the start, in the braking zone to turn 1, car 18 collided with car 16.
"The stewards took into consideration the track conditions, however, the driver of car
18 was fully to blame for the collision."
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