Patricio Walker Prieto (born 28 April 1969) is a Chilean politician. He was President of the Senate between 11 March 2015 and 15 March 2016.

A former member of the Christian Democratic Party. He served as a Senator for the 18th Senatorial District, representing the Aysén Region, between 2010 and 2018. He was President of the Senate of Chile from 11 March 2015 to 15 March 2016.

Previously, he was a Member of the Chamber of Deputies for District No. 8 in the Coquimbo Region, serving three consecutive terms between 1998 and 2010. He also served as President of the Chamber of Deputies of Chile between March 2007 and March 2008.

Walker was born in Santiago on 28 April 1969. He is the son of Ignacio Joaquín Walker Concha and Isabel Margarita Prieto Vial. Among his nine siblings are former senator Ignacio Walker Prieto and senator Matías Walker Prieto. His grandfather was senator Horacio Walker Larraín, and his great-grandfather was senator Joaquín Walker Martínez. He is married to Francisca Ibarra Ovalle and has four children.

Between 1975 and 1983, he completed his primary education at Colegio San Ignacio. He continued his secondary education at the Seminario Menor School, graduating in 1987. In 1988, he entered the School of Law at Diego Portales University and he obtained his degree in 1994. He was admitted to the bar by the Supreme Court of Chile on 16 January 1995.

In 1987, Walker was selected as the representative of Chilean youth at the Third World Youth Meeting held in Argentina, where he delivered the official address before Pope John Paul II.

Between 1993 and 1996, Walker worked as a legislative advisor at the Ministry of Housing and Urbanism. In the academic field, he served as a faculty member in the Competitiveness Leadership Program at Georgetown University between 2010 and 2018.

In 2019, he obtained, with highest distinction, a Master of Laws (LL.M.) in Regulatory Law from the Pontifical Catholic University of Chile.