Csíkszék

{{No footnotes|date=November 2014}}

{{Infobox former subdivision

|_noautocat =no

|conventional_long_name = Csíkszék

|common_name = Csíkszék

|subdivision = Seat

|nation = the Székely Land

|capital = Csíksomlyó

|latd= |latm= |latNS= |longd= |longm= |longEW=

|today = Romania

|year_start = 11th century{{citation needed|date=November 2014}}

|year_end = 1876

|event_start = Settlement of the Székelys

|event_end = Administrative reform of the Kingdom of Hungary

|image_coat =

|symbol_type =

|symbol =

|image_map =

|image_map_caption =

|stat_year1 = 1867

|stat_area1 =

|stat_pop1 = 111,237

|footnotes = Șumuleu Ciuc is the current name of the capital.

}}

Csíkszék ({{IPA|hu|ˈt͡ʃiːkseːk}}) was one of the Székely seats in the historical Székely Land.

It administered two sub-seats (Hungarian: fiúszék, Latin: sedes filialis), namely Gyergyószék and Kászonszék. It was divided on the natural borders of the region, as the main territory of Csíkszék lay in the valley of the Olt River, Gyergyószék lay in the valley of the river Maros (Mureș), while Kászonszék lay in the valley of the river Kászon (Cașin).