Newnham is a small village and civil parish near Ashwell in the North Hertfordshire district, in the county of Hertfordshire, England.

It shares a grouped parish council with neighbouring Caldecote, called Caldecote and Newnham Parish Council, although the two remain separate civil parishes.

[1] The parish church is St Vincent's and features several medieval wall murals.

The solicitor and historian Reginald Hine (1883-1949) was born in Newnham Hall.

Due to the small population of the parish and its neighbours, statistics are presented jointly for the three parishes of Caldecote, Newnham and Radwell, in order to protect individuals' privacy.