| Events in the year 660 in Japan. Events
 *date unknown - After the fall of Sabi to the forces of Silla, the Yamato government sends envoys directly to the Chinese court for the first time
 *date unknown - The Baekje-Tang War begins, involving Yamato forces in support of the kingdoms of Baekje and Goguryeo
 *date unknown - The first Japanese water clock was created by Prince
 *date unknown - Japanese forces, under command of Abe no Hirafu, massacre the Mishihase people in Hokkaido
 *date unknown - The capital of Japan moves from Asuka, Yamato (Okamoto Palace or Nochi no Asuka-Okamoto-no-miya) to Asakura, Fukuoka
 Incumbents
 *Monarch:  (a.k.a., Empress Saimei)
 Births
 *date unknown - Empress Genmei (d. 721)
 *date unknown - Yamanoue no Okura (d. 733), Japanese poet
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 Deaths
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