Ostrobothnia County

{{Short description|Province of the Kingdom of Sweden (1634–1775)}}

{{Unreferenced|date=April 2012}}

{{Infobox Former Subdivision

|conventional_long_name = Ostrobothnia County

|native_name = Österbottens län
Pohjanmaan lääni

|common_name = Ostrobothnia

|subdivision = County

|nation = the Swedish Empire

|year_start = 1634

|event_start = Established

|date_start =

|event_end =

|year_end = 1775

|date_end =

|event1 =

|date_event1 =

|p1 =

|flag_p1 =

|s1 = Vaasa Province

|flag_s1 = Flag of Sweden.svg

|s2 = Oulu Province

|flag_s2 = Flag of Sweden.svg

|image_flag =

|image_coat =

|image_map =

|image_map_caption =

|capital = Vaasa

}}

Ostrobothnia County ({{Langx|sv|Österbottens län}}, {{Langx|fi|Pohjanmaan lääni}}) was a county of the Swedish Empire from 1634 to 1775.

The county was split in 1755 to County of Vasa ({{Langx|sv|Vasa län}}, {{Langx|fi|Vaasan lääni}}) and County of Uleåborg ({{Langx|sv|Uleåborg län}}, {{Langx|fi|Oulun lääni}}).