Cahersiveen (Irish: Cathair Saidhbhín, meaning "Little Sadhbh's stone ringfort")—alternate spellings Cahirsiveen, Cahirciveen or Caherciveen—is a town in the Region of Skellig Kerry, County Kerry, Ireland. It is located on the River Fertha and is the principal town of the Iveragh Peninsula. Cahersiveen is near Valentia Island and is connected to the Irish road network by the N70 road. It has a population of 1,294 (CSO 2006).
The Catholic church in the town is the only one in Ireland named after a lay person, Daniel O'Connell. It is situated on the slopes of Beentee. It also contains a decommissioned Royal Irish Constabulary barracks, now a heritage centre, which according to legend, was built from the plans for a British barracks in India that got mixed up (a very common myth that occurs in many Irish garrison towns).
Cahersiveen was where the first shots of the Fenian Rising were fired in 1867.
The town is served by two main schools, one each for girls and boys. Scoil Mhuire, the boys primary school and St.Joseph's convent, the girls' primary school. There are 12 schools in total in the area, including three other schools on the outskirts of the town: Aghatubrid National School, Coars National School, and Foilmore National School. The Aghatubrid school was established in 1964 and has approximately 88 students.