The M3 is an expressway in Cape Town, South Africa, connecting the upper part of the City Bowl to the Southern Suburbs and ending in Tokai.

Around Hospital Bend, the M3 is concurrent with the N2 for approximately a kilometre as a highway with 5 lanes in each direction; when the N2 branches off to the east as Settlers Way, the M3 runs south as Rhodes Drive past the University of Cape Town.

This section of the highway forms the western boundary of the suburbs of Mowbray, Rosebank, Rondebosch, and part of Newlands.

It separates these suburbs from the Table Mountain National Park, except where the Upper Campus of the University is located west of the freeway.

Steenberg Road connects the terminus of the M3 with Main Road (the M4) in the east, which continues southwards along the False Bay coast to Muizenberg, Fish Hoek, and Simon's Town; and with Ou Kaapse Weg (the M64) in the west, which crosses the Silvermine mountains to Noordhoek.