Fen Alder Carr is a 1.7 hectare Local Nature Reserve south-east of Creeting St Peter in Suffolk. It is owned by Suffolk County Council.

This site has diverse habitats, including open water, alder carr woodland and tall fen. There is a large rookery high in the trees, and there are other birds such as siskins, chaffinches and redpolls.

There is access from Fen Lane.

52°10′05″N 1°03′11″E / 52.168°N 1.053°E / 52.168; 1.053