Masayuki Iwamoto
| 4835 Asaeus | January 29, 1989 | IAU[1] |
| 5399 Awa | January 29, 1989 | MPC[1] |
| 5581 Mitsuko | February 10, 1989 | MPC[1] |
| 6383 Tokushima | December 12, 1988 | MPC[1] |
| 9943 Bizan | October 29, 1989 | MPC[1] |
| 27714 Dochu | January 29, 1989 | MPC[1] |
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Masayuki Iwamoto (岩本 雅之, Iwamoto Masayuki; born 1954) is a Japanese astronomer from Awa in the Tokushima Prefecture. The Minor Planet Center credits him with the co-discovery of 6 asteroids made together with Japanese astronomer Toshimasa Furuta at the Tokushima-Kainan Astronomical Observatory (872) in 1988 and 1989. He also received the Edgar Wilson Award in 2013 for the discovery of comet C/2013 E2, in 2019 for the discovery of the comets C/2018 V1 and C/2018 Y1 and in 2021 for the discovery of C/2020 A2.
The inner main-belt asteroid 4951 Iwamoto, discovered by astronomers Yoshikane Mizuno and Toshimasa Furuta, was named in his honor on 5 March 1996 (M.P.C. 26763).