Estonian national road 12

{{Short description|Road in Estonia}}

{{Infobox road

|country=EST

|type=B

|route=12

|alternate_name=

|maint=

|map=

|photo=Kose-Jägala_maantee_Kose_piiril.jpg

|length_km=36.1

|length_ref=

|established=

|direction_a=

|terminus_a=Kose ({{jct|country=EST|N|2}})

|junction=

|direction_b=

|terminus_b=Jägala ({{jct|country=EST|B|13}})

|cities=

|previous_type=National

|previous_route=11

|next_type=National

|next_route=13

}}

Tugimaantee 12 (ofcl. abbr. T12), also called the Kose–Jägala highway ({{langx|et|Kose–Jägala maantee}}), is a 36.1-kilometre-long{{cite web|url=https://www.riigiteataja.ee/akt/12914350|title=Riigimaanteede nimekiri ja riigimaanteede liigid|publisher=riigiteataja|language=et}} national basic road in northern Estonia. The highway begins at Kose on national road 2 and ends at Jägala on national road 13.{{cite web | url = https://xgis.maaamet.ee/maps/XGis | title = Maainfo Kaardirakendus | publisher = Maa-amet | accessdate = 11 August 2018 | language = et, en }}