Gualdi is an Italian surname. Notable people with the surname include:
Abbe Gualdi, a pseudonym of Gregorio Leti (1630–1701), Italian historian and satirist Domenico Gualdi (born 1974), Italian former professional racing cyclist Giovanni Gualdi (born 1979), former Italian male long-distance runner Mirco Gualdi (born 1968), Italian former professional racing cyclist (1932–2007), German singer and actress Pietro Gualdi, aka Pedro Gualdi (1808–1857), Italian-born artist, panorama painter, architect and lithographer active in Mexico City Pietro Gualdi Lodrini (1716–circa 1784), Italian painter