The RM-89 Blue Scout I was an American sounding rocket which was flown four times between January 1961 and April 1962.

They both carried HETS A1 plasma research experiments on suborbital trajectories.

The second two launches were conducted on 12 April 1962, with a payload that was intended to investigate atmospheric reentry.

The second two launches failed due to problems with the Blue Scout.

It was flown four times in 1961, twice with HETS payloads, and twice with the Mercury-Scout 1 satellite.