The A3215 is a short link road near London Victoria Station, being part of the area's one-way system.
The road starts on the A3214 Buckingham Palace Road on the southern corner of Grosvenor Gardens, where that road's northbound traffic is forced left onto the A3215. The road runs northwestwards along the southwestern side of the Gardens, one-way in its entirety, to end at traffic lights on the A302, which is also one-way, about 150 yards further on.
Owing to the road's short length (identical to its 1922 classification) there is some debate as to its continued existence, with some maps claiming it to be a spur of the A302.