The A209 road is a 2-mile (3.2 km) route in southeast London, England.

It connects Plumstead in the north with Welling in the south, passing through East Wickham.

It is known as Wickham Lane at the northern end in the Royal Borough of Greenwich and Upper Wickham Lane at the southern end in the London Borough of Bexley.

It begins at 'Plumstead Corner', a junction with the A206 road Plumstead High Street.

It ends at a junction with the A207 road at Welling Corner, after passing under the Bexleyheath Line.