Japan National Route 503

{{Short description|Road in Japan}}

{{Infobox road

|country=JPN

|type=National

|route=503

|maint=

|alternate_name=

|map={{Maplink|frame=yes|plain=yes|zoom=|from=|frame-align=center|frame-height=300|frame-width=|type=line|stroke-width=2}}

|map_custom=yes

|length_km=112.7

|length_round=

|length_ref={{cite web|title=一般国道の路線別、都道府県別道路現況|trans-title=Road statistics by General National Highway route and prefecture|url=http://www.mlit.go.jp/road/ir/ir-data/tokei-nen/2016/pdf/d_genkyou26.pdf|language=ja|publisher=Ministry of Land, Infrastructure, Transport and Tourism|access-date=10 February 2020}}

|established={{start date and age|1993}}

|direction_a=North

|terminus_a={{jct|country=JPN|Route|265|Route|315}} in Takamori, Kumamoto

|junction=

|direction_b=South

|terminus_b={{jct|country=JPN|Route|10}} in Hyūga, Miyazaki

|previous_type=Route

|previous_route=502

|next_type=Route

|next_route=504

|browse=

}}

{{One source|date=February 2023}}

National Route 503 is a national highway of Japan connecting between Takamori, Kumamoto and Hyūga, Miyazaki in Japan, with total length has {{Convert|112.7|km|mi|abbr=on}}.