Tester, and variants Testar and Testard, is a surname of French origin, originally given as a nickname to one with a large head.
The name may refer to:
In the arts Desmond Tester (1919–2002), Anglo-Australian actor Ruth Tester (1903–1993), American actress Scan Tester (1887–1972), English folk and country musician William Tester (born 1960), American novelist
In politics John Tester (1835–1918), American politician and businessman Jon Tester (born 1956), U.S. Senator from Montana
Other people Mark Tester (born 1963), Australian botanist Ralph Tester (1902–1998), head of the Testery, a British codebreaking station at Bletchley Park
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