The A102 is a road that starts in Clapton, east London, and ends by merging into the A2 road just south of the Sun in the Sands roundabout in Blackheath, south-east London.

The total length of the road (including both sections) is approximately 4.4 miles (7.1 km).

It runs south along Urswick Road and continues east past 16th century Sutton House and into Homerton High Street.

South of the A12/A13 interchange with the adjacent landmark Ernő Goldfinger designed Balfron Tower, the designation of the Blackwall Tunnel Approach reverts to the A102 through the Blackwall Tunnels and under the River Thames to Greenwich.

When the A12 extension was opened through Wanstead, Leytonstone and Leyton to meet the north end of the East Cross Route at the Lea Interchange (and prompting the M11 link road protest), the northern section of the A102(M) and the A102 as far south as the A13 were renumbered A12.