Testwood Lakes is a 55-hectare (140-acre) nature reserve in Totton to the northwest of Southampton in Hampshire, England.

The 4th New Forest North (Eling) Sea Scout group has built a headquarters building at Testwood Lakes which is their base for watersport activities.

The Centre, which has a permanent exhibition featuring themes of water, wildlife and conservation, is open to schools, community groups and individuals, with facilities such as a well-equipped classroom for up to 60 children and two function rooms available for hire.

The lake is 30 feet deep in the middle and contains large bream, tench, pike, perch, roach, chub and eels.

The ground flora of Alder Gully is very rich including lesser spearwort, bluebell, yellow pimpernel, moschatel, red campion and foxglove.