Klaas Annink (18 June 1710 – 13 September 1775), better known as Huttenkloas, was a Dutch murderer and suspected serial killer in Twente, Netherlands.
He was reputedly responsible, together with his wife Aarne Spanjers and his son, Jannes, for numerous robberies and murders in the region in and around Hengevelde.
In 1774, a merchant from Hanover investigated and found convincing evidence that Annink was responsible for the disappearance and murder of one of his family members.
The seat in which Klaas Annink sat, known as the "Chair of Huttenkloas", is still on display in the Ancient Chamber room in the Palthehuis Museum in Oldenzaal.
Klaas Annink's infamous nickname, Huttenkloas, has not been forgotten, having been adopted by a local brewery.