Tamzin Malleson (born 1 May 1974) is a British actress.
Malleson was born in Yeovil, and attended Horsley Primary School in Horsley, Gloucestershire, where she had her first taste of acting as a Munchkin. She furthered her drama activities in Archway School in Stroud, Gloucestershire.
She originally played Alison Dangerfield in Series 3 and 4 of the BBC drama Dangerfield, before going on to play one of the starring roles (Penny Neville) in the Channel 4 comedy Teachers for three of the programme's four series, and she starred in one of ITV's Poirot adaptations, "Evil Under The Sun". She appeared in The Bill, and in the detective show A Touch of Frost, and starred in the BBC medical drama Bodies.
Malleson played the role of Kate Wilding, the pathologist in the series Midsomer Murders, from the middle of series 14 to the end of series 17.
Malleson is in a relationship with actor Keith Allen, father of actors Lily Allen and Alfie Allen, who starred alongside her in Bodies. The couple have one daughter, the actress Teddie Allen, who was born in 2006. They live near Stroud, Gloucestershire. In 2017, Allen and Malleson opened a diner in Stroud, built with the diner set of ', in which Allen had appeared.