Masaru Arai (新井 優, Arai Masaru, born 1952) is a Japanese amateur astronomer and a discoverer of minor planets and comets.
[2] He is credited by the Minor Planet Center with the discovery of 45 minor planets during 1988–1991, all in collaboration with astronomer Hiroshi Mori.
[1] On 5 January 1991, he has also discovered Comet Arai, C/1991 A2.
[3][4] The main-belt asteroid 21082 Araimasaru, discovered by Tsutomu Hioki and Shuji Hayakawa at Okutama in 1991, was named in his honor.
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