Wyncham Stream (Also spelt Wincham Stream) is a small river within the London Boroughs of Bexley and Bromley in southeast London, England, United Kingdom. It is 5.6 km (3.5 mi) in length and is a tributary of the River Shuttle.

The stream rises from several sources in Chislehurst in the London Borough of Bromley and the BR7 post code area. It then flows north through Foxbury and Kemnal, with small ponds and woodlands such as Ash Grove on its course, following some of Kemnal Road and passing through the sports grounds of Flamingo Park and the Jack Nicklaus Golf Centre. It continues northeast under the Sidcup By-Pass (A20) and the adjacent Foots Cray Road (A211) into the London Borough of Bexley and DA15 post code area. It then flows under the section of railway line between Sidcup and New Eltham stations and under several residential roads, including Halfway Street (B2214), passing through Longlands, Lamorbey, on the northwest side of Sidcup. Where the stream passes under Halfway Street, the bridge here was named Wincham Bridge in the early twentieth century, and Vincent Bridge in the nineteenth century. The stream then passes through some small green areas including allotments, the small Beverley Wood, and finally flows into Blackfen where it joins the longer River Shuttle in Hollyoak Wood Park.

Some of the stream's course lies between the backs of domestic gardens, while in other places some roads have been built with a separate lane either side of the river with narrow grassy banks. Some of the small nearby residential roads have river-related names, such as Wyncham Avenue, taken directly from the river, but also: Brooklands Road, Brookend Road, and Shuttle Close after the River Shuttle.

vteWyncham Stream
Blackfen Hollyoak Wood Park River Shuttle Wyncham Stream Oaklands Avenue drain Beverley Wood Shuttle Close Annadale Road Woodlands Avenue Wyncham Avenue Halfway Street, A2212 road (Wincham Bridge), Lamourbey Longmeadow Road Brookend Road Old Farm Avenue Old Farm Avenue Allotments Old Farm Avenue Allotments Dartford Loop Line Dulverton Primary School Harland Avenue Allotments Dulverton Road Frensham Road Brooklands Avenue Wyncham Stream Longlands Stream Harland Avenue Blenhelm Court Marechal Niel Avenue Longlands A211 Main Road Woodchurch Close London Borough of Bexley A20 Sidcup By-Pass London Borough of Bromley Kemnal Park Cemetery Partridge Stream Kemnal Partridge Shaw Kemnal Stream Young Alders Belmont Lane Open Space Kemnal Road Ashen Grove Belmont Belmont Stream Kemnal Wood Woodside Avenue Kemnal Road Foxbury Foxberry Stream Grubfield Wood Foxberry Stream Chislehurst Cemetery Foxburrow Wood Chislehurst School for Girls Longlands Stream Stock Wells Old Alders Chislehurst Quennsborough Gardens Marlowe Close Ashfield Lane Chislehurst Common Wyncham Stream
BlackfenHollyoak Wood Park
River Shuttle
Wyncham Stream
Oaklands Avenue
drain
Beverley WoodShuttle Close
Annadale Road
Woodlands AvenueWyncham Avenue
Halfway Street, A2212 road(Wincham Bridge), Lamourbey
Longmeadow RoadBrookend Road
Old Farm Avenue
Old Farm Avenue AllotmentsOld Farm Avenue Allotments
Dartford Loop Line
Dulverton Primary SchoolHarland Avenue Allotments
Dulverton Road
Frensham RoadBrooklands Avenue
Wyncham StreamLonglands Stream
Harland Avenue
Blenhelm Court
Marechal Niel Avenue
LonglandsA211 Main Road
Woodchurch Close
London Borough of BexleyA20 Sidcup By-Pass
London Borough of Bromley
Kemnal Park CemeteryPartridge Stream
KemnalPartridge Shaw
Kemnal StreamYoung Alders
Belmont Lane Open Space
Kemnal RoadAshen Grove
Belmont
Belmont StreamKemnal Wood
Woodside Avenue
Kemnal RoadFoxbury
Foxberry Stream
Grubfield Wood
Foxberry StreamChislehurst Cemetery
Foxburrow WoodChislehurst School for Girls
Longlands Stream
Stock Wells
Old Alders
ChislehurstQuennsborough Gardens
Marlowe Close
Ashfield Lane
Chislehurst Common
Wyncham Stream

Coordinates: 51°26′24″N 0°05′31″E/51.440°N 0.092°E/ 51.440; 0.092