Pia Cayetano, Filipino lawyer and politician
Pilar Juliana "Pia" Schramm Cayetano (born March 22, 1966) is a Filipina politician and lawyer serving as a Senator since 2019, a position she previously held from 2004 to 2016. She was also the Representative of Taguig City's lone district from 2016 to 2019 and was one of the Deputy Speakers.

Cayetano was born to a political family currently based in Taguig. Her father was the late former senator Rene Cayetano; her younger brother, Alan Peter, is an incumbent representative of Taguig and former Speaker of the House; another younger brother, Rene Carl, is a former councilor of Muntinlupa; her youngest brother, Lino, is the incumbent mayor of Taguig; and her sister-in-law (Alan Peter's wife) Lani, is another incumbent representative of Taguig.

Cayetano authored the Expanded Senior Citizens Act, Expanded Breastfeeding Promoting Act, and the Responsible Parenthood and Reproductive Health Act of 2012, among others. She earned her economics (cum laude) and law degrees at the University of the Philippines, where she played volleyball for the UP Lady Maroons team that won the 1983 UAAP title. She has also played for the national women's volleyball team. Cayetano is also a runner, cyclist, and triathlete.

Pia Cayetano was conferred the Rizal Women of Malalos Award by the Order of the Knights of Rizal.