Pyl Brook is a small stream in southwest London. It is a tributary of Beverley Brook, which is a tributary of the River Thames. Pyl Brook has two sources. The 5.3 kilometre main brook rises in Sutton and flows through the London Borough of Merton to join Beverley Brook at Beverley Park in New Malden. The 3.9 kilometre East Pyl Brook also rises in Sutton and flows through Merton, joining the main Pyl east of Grand Drive in Raynes Park.