Car:
From the M25:
Exit at J12 onto the M3. This becomes the A316, and Twickenham Stadium is off the Whitton Road roundabout next to the Lexus/Toyota car dealership.

From London:
Turn right off the A316 at Whitton Road roundabout.

Bus:
Line 281, 267 & H22

Metro (Underground):
Richmond (District Line) & Hounslow East (Piccadilly Line).

Train:
Twickenham Station (5 minutes walk)