Nishimura & Asahi (西村あさひ法律事務所, Nishimura Asahi Hōritsu Jimusho) is the biggest of the "Big Four" law firms in Japan, as of January 2018, by number of lawyers. The firm's current form was established in 2007 by the acquisition of the Kokusai Bumon (International Division) of Asahi Law Offices (the former Asahi Koma Law Offices, itself a merger of the Masuda & Ejiri and Komatsu Koma law firms) by Nishimura & Partners (one of the "Big Four" and founded in 1966). The firm is a member of the international legal network Lex Mundi.