Newnham (since circa 1718 Old Newnham) in the parish of Plympton St Mary in Devon is a historic estate long held by the Devonshire gentry family of Strode. The ancient mansion house is situated 1 mile north-east of St Mary's Church, beside the Smallhanger Brook, a tributary of the Tory Brook, itself flowing into the River Plym. The house was abandoned by the Strode family in about 1700 when they built a new mansion on the site of Loughtor Manor House, about 1/3 mile to the north-east of Old Newnham.