Clennell is an English surname.
Notable people with this surname include: Irene Clennell (born 1964), Singaporean citizen involved in a UK immigration case Joe Clennell (1889–1965), English footballer John Clennell (1772–1822), English journalist Luke Clennell (1781–1840), English engraver Paula Clennell, victim in the Ipswich serial murders Tony Clennell (born 1951), Canadian potter
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