Boonstra is a Dutch surname. Notable people with the surname include:
Albert Boonstra (born 1957), Dutch swimmerClarence A. Boonstra (1914–2006), American ambassadorCor Boonstra (born 1938), Dutch chief executiveDirk Boonstra (1893–1944), Dutch police officerDirk Boonstra (1920–1944), Dutch Resistance memberLieuwe Dirk Boonstra (1905–1975), South African paleontologistTjabel Boonstra (1899–1968), Dutch cyclist