Alli is a surname. Notable people with the surname include:
Antero Alli (born 1952), professional astrologer
Darogha Ubbas Alli (19th century), Indian engineer and photographer
Dele Alli (born 1996), professional footballer
Waheed Alli, Baron Alli (born 1964), British multimillionaire media entrepreneur and politician and notable gay Muslim
Yusuf Alli (born 1960), retired Nigerian long jumper
It has also been used as a given name:
Alli Sims (born 1981), socialite and cousin to Britney Spears