Leclerc was 11 seconds clear with seven laps to go and 8.3 ahead with five remaining as the massed ranks of 'tifosi' willed him on.
The pole was the 95th of Hamilton's career and seventh in nine races this season, continuing Mercedes' 100% record in qualifying.
Images from the Tuscan F1 Grand Prix held at at Mugello, Scarperia e San Piero in Tuscany, Italy, on Sunday.
A first-half goal by Maxi Lopez gave Sampdoria a 1-0 win over Genoa in their derby on Monday as they avenged their 3-0 drubbing by their old rivals earlier in the season.
Mauricio Pinilla converted a late penalty to give Atalanta a 2-1 win over Inter Milan and condemn their troubled opponents to a third successive Serie A defeat on Sunday.
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