The local Church of Sant'Abbondio (not to be confused with the nearby Swiss municipality of Sant'Abbondio or the Basilica of Sant'Abbondio in Lombard, Italy) is noteworthy for dating from the eleventh century. The cemetery of Sant'Abbondio is the resting place of Hugo Ball, Bruno Walter, and Hermann Hesse. It is a Swiss heritage site of national significance.
Gentilino is first mentioned in 1210 as Gentarino'.
In the Early Middle Ages Gentilino belonged to the royal court of Agnuzzo, which was donated in 818 by Emperor Louis the Pious to the clergy of Como. During the 11th Century it belonged to the monastery of S. Abbondio in Como. The union of the monastic estates in 1335 probably led to the creation of the Concilium Sancti Abundii which included Gentilino and Viglio as well as Montagnola and the surrounding villages. In the early 18th Century, the village wanted to buy the monastery's rights to the village. However, this triggered a long-running dispute, in which the Canton was eventually involved.
It is believed that the church of S. Abbondio was the center of a medieval parish, which became a sub-parish in the 11th Century. However, the first written record of the church dates from 1140. The current appearance is due to an enlargement in the 17th Century.
In the past centuries, the population lived mainly from agriculture, but there were also a large exodus of builders (known as Maestranze). Recently, it has grown into a bedroom community for the nearby city of Lugano.
Until the merger, it included the north side of the Collina d'Oro valley, and the settlement of Viglio.
A pre-primary school is located in Gentilino.
The historical population is given in the following chart:
- Gentilino in German, French and Italian in the online Historical Dictionary of Switzerland.
- "Kantonsliste A-Objekte:Ticino" (PDF). KGS Inventar (in German). Federal Office of Civil Protection. 2009. Archived from the original (PDF) on 6 July 2011. Retrieved 12 July 2010.
- Amtliches Gemeindeverzeichnis der Schweiz published by the Swiss Federal Statistical Office (German) accessed 14 January 2010
- "Istruzione" (Archive). Collina d'Oro commune. Retrieved on April 223, 2015.