National Route 123 is a national highway of Japan connecting Utsunomiya and Mito, Ibaraki in Japan, with a total length of 70 km (43.5 mi).

Route 123 was originally designated on 18 May 1953 from Chiba to Mito.

This was redesignated Route 51 on 1 April 1963 and the current Route 123 was designated the same day.

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