William Holl the Younger (February 1807 in Plaistow, Essex – 30 January 1871) was a British portrait and figure engraver, noted for his book illustrations.
The eldest of four sons of William Holl the Elder (1771–1838), he was taught engraving by his father – at first stipple and later line on steel.
Working with his brother Francis Holl (1815–84), he provided engraved illustrations to Finden's 1837 Tableaux of National Character and Gallery of Beauty of 1841 and to the 1840 edition of The Land of Burns.
The youngest brother, Henry Benjamin Holl (1808–1884) also achieved notable success as a portrait and figure engraver and later emigrated to the US.
He also produced portraits for the Imperial Dictionary (1861) and Thomas Baines's Yorkshire Past and Present (1871–77).