Thill is a surname. Notable people with the surname include:
Francis Augustine Thill (1893–1957), American Roman Catholic bishop Georges Thill (1897–1984), French opera singer Lewis D. Thill (1903–1975), American politician Jang Thill (1913–1984), Luxembourgish painter Roland Thill (1954–2017), Luxembourgish footballer Agnès Thill (born 1964), French politician Tom Thill (born 1990), Luxembourgish cyclist Sébastien Thill (born 1993), Luxembourgish footballer Olivier Thill (born 1996), Luxembourgish footballer Vincent Thill (born 2000), Luxembourgish footballer Jessie Thill (born 1996), Luxembourgish politician