National Route 143
国道143号
Route information
Length	51 km[1] (32 mi)
Existed	1953–present
Major junctions
West end	National Route 19 / National Route 158 in Matsumoto, Nagano
East end	National Route 18 in Ueda, Nagano
Location
Country	Japan
Highway system
National highways of Japan Expressways of Japan
← National Route 142 → National Route 144

National Route 143 is a national highway of Japan connecting Matsumoto, Nagano and Ueda, Nagano in Japan, with a total length of 51 km (32 mi).