Japan National Route 278

{{short description|National highway in Japan}}

{{Infobox road

|country=JPN

|type=National

|route=278

|maint=

|alternate_name=

|map={{Maplink|zoom=8|frame=yes|plain=yes|frame-align=center|frame-width=300|frame-height=300|frame-latitude=41.9|frame-longitude=140.8|type=line|stroke-color=#cc0000|stroke-width=2}}

|map_custom=yes

|image=北海道道63号函館空港線・国道278号交点（国道278号終点側から）.jpg

|map_notes=Japan National Route 278 highlighted in red

|length_km=114.3

|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=

|direction_a=

|terminus_a=

|junction=

|direction_b=

|terminus_b=

|previous_type=Route

|previous_route=277

|next_type=Route

|next_route=279

|browse=

}}

{{Nihongo|National Route 278|国道278号|Kokudō Nihyaku nana-juhachigō}} is a national highway on the island and prefecture of Hokkaido in northern Japan. The {{convert|114.3|km|mi|adj=on|sp=us}} highway connects Hakodate and Mori.