Topsy and Tim is a series of children's books written by Jean Adamson and Gareth Adamson about twins and their adventures with their friends. They were first published by Blackie in 1960; Topsy and Tim were relaunched in new editions in 1990, 2003 and 2009. In 2020, Topsy and Tim On the Farm was reprinted to celebrate 60 years since the first publication.