St Leonard's ward is an administrative division of the London Borough of Lambeth, United Kingdom. It is located in the South West of the borough and shares a border with Wandsworth. The ward comprises the western part of the Streatham town centre and is mostly to the west of the A23 Streatham High Road with the exception of the Stanthorpe Triangle area immediately east of St Leonard's church in the historic village centre.
St Leonard's ward is located in the Streatham Parliamentary constituency.
At the Lambeth Council elections, 2010 residents of St Leonard's ward elected three Liberal Democrat Councillors.