Sádlo (feminine: Sádlová) is a Czech surname, meaning 'lard'. Notable people with the surname include:
Christiane Sadlo (born 1954), German screenwriter and journalist Karel Pravoslav Sádlo (1898–1971), Czech cellist Mike Sadlo (born 1971), German footballer Miloš Sádlo (1912–2003), Czech cellist Miloslav Sádlo (1897–1961), Czech violist and soloist
See also