Blatherwick is a surname. Notable people with the surname include:
David Blatherwick (artist) (born 1960), Canadian painter and video artist David Blatherwick (diplomat) (born 1941), British diplomat Francis John Blatherwick (born 1944), Canadian medical health officer Jack Blatherwick (born 1998), English cricketer Jennifer Blatherwick, Canadian politician Lily Blatherwick (1854–1934), English painter Steve Blatherwick (born 1973), English footballer Thomas Blatherwick, English rugby player Wilfred Blatherwick (1870–1956), American tennis player
See also Hugill & Blatherwick, architectural firm in Sioux Falls, South Dakota Blatherwycke, village in Northamptonshire, England Bathwick