Teddington Harbour sits on the north bank of the River Thames approximately 11 miles southwest of central London, near the boundary of Middlesex.

It is closely associated with Teddington Lock, which marks the tidal limit of the Thames and the upstream boundary of the Port of London Authority's jurisdiction — making it a significant transition point for river navigation.

The harbour offers pontoon moorings just outside the lock and within the weirstream, and serves as a practical base for boaters planning to travel downriver toward London or upstream into calmer, non-tidal waters.

A smaller associated marina is located nearby in Hampton Wick, close to Kingston Bridge. The surrounding stretch of the Thames is generally considered straightforward to navigate, and the area is accessible by road from the M3 motorway.