The A3200 is a short road on the south bank of the Thames between London Bridge and County Hall.
It starts on the A3 Borough High Street just south of London Bridge before heading westwards along Southwark Street. It goes under two railway bridges before crossing the A201 at traffic lights to run onto Stamford Street. After crossing the A301 at the roundabout by Waterloo Station it goes under a third railway bridge and then runs between the station and the Thames southwards along York Road. On reaching County Hall it ends on what was a gyratory, now a complicated signalised junction, where the A23 morphs into the A302.