The Scout X-2B was an American expendable launch system which was flown during 1963.
It was a four-stage rocket, based on the earlier Scout X-2, but with an Altair 2A fourth stage in place of the Altair 1A used on the X-2.
It was a member of the Scout family of rockets.
It made only one flight, which was launched from Launch Complex D at Point Arguello, carrying a P-35 weather satellites, P35-5.
The launch occurred on 27 September 1963, and failed to achieve orbit.