Szeklerland [ˈseːk-] (Hungarian Székelyföld, Romanian Ținutul Secuiesc or Secuime, Latin Terra Siculorum) is the area in the east of Transylvania in Romania, where Szeklers in particular settle.
The historical Szeklerland is located in the east of the Transylvanian Basin, within the Carpathian arc and partly in the Eastern Carpathians in the central part of Romania. The area includes most of the present-day Romanian counties of Harghita and Covasna, the middle part of Mureș County, smaller parts of Alba and Cluj counties (the towns of the former Szekler Chair of Aranyos around the municipality of Unirea (Oberwinz)) as well as individual municipalities in the counties of Neamț (Bicazu Ardelean, Bicaz-Chei and Dămuc) and Bacău (Ghimeș-Făget).
The cultural and political centre of Szeklerland used to be the town of Székelyudvarhely (Odorheiu Secuiesc) west of the Harghita Mountains. Other important places were Marosvásárhely (Târgu Mureș), Csíkszereda (Miercurea Ciuc) and Sepsiszentgyörgy (Sfântu Gheorghe). Today, Târgu Mureș is considered the political, economic and cultural centre of the Szeklers in Transylvania.