Ōmiwa Shrine, Shinto shrine in Hanaiike, Ichinomiya, Japan

Ōmiwa Shrine is a Shinto temple in Ichinomiya constructed using the traditional nagare-zukuri architectural style. This building design features characteristic sloping roofs and a well-proportioned layout that integrates the structure naturally into its surroundings.

The founding date is unknown. Until the Edo period the shrine was called Sanmyōjin or Sannomiya Myōjin and served as the tutelary shrine of Miyaji Hanaike village. It is identified with the Owari Nakashima district shrine "Ōmiwa Jinja, Myōjin-taisha" listed in the Engishiki, compiled in the Heian period; a 1350 donation document places Ōmiwa's land northeast of Tohaka. In May 1872 it was ranked a gōsha under the modern shrine ranking system.

The shrine's name comes from Ōmononushi, the deity of Ōmiwa Shrine in Nara, not from Mount Miwa. Until the Edo period it was called Sanmyōjin or Sangu Myōjin and served as the tutelary shrine of Miyaji-Hanaike village. A wooden pair of komainu guardian dogs, carved in 1815 from cypress, is a city-designated cultural property.

The shrine stands at 2-15-28 Hanaike, Ichinomiya, Aichi, about five minutes on foot from Myōkōji Station on the Meitetsu Nagoya Main Line, or roughly twenty minutes from Meitetsu Ichinomiya and JR Owari-Ichinomiya stations. No priest is resident; the grounds are looked after by the priest of Ōmiwa Shrine in the city.

The shrine claims the title of Owari Province's ichinomiya alongside Masumida Shrine, and both shrines maintain they formed a paired set of first shrines. Most references, however, name Masumida alone as Owari's ichinomiya. The shrine joined the National Association of Ichinomiya shrines on that basis.