Casimiro "Jun" Alcantara Ynares III (born March 4, 1973) is a Filipino physician and politician who is currently serving as the mayor of Antipolo since 2022, previously holding the position from 2013 to 2019.

[1] He previously served as the governor of Rizal from 2007 to 2013, as well as the public information officer of Antipolo from 2019 to 2022 under the mayorship of his wife, Andrea Bautista-Ynares.

On January 30, 2004, president Gloria Macapagal Arroyo announced the appointment of Ynares as general manager of the Laguna Lake Development Authority, with him taking office by February 2.

He said that the office would make the programs and services of the DSWD more accessible not just to Antipolo residents, but also to the people of Rizal and nearby towns of Laguna.

[14] Ynares met Andrea Bautista while he was attending medical school at the De La Salle University – Dasmariñas; they married on November 19, 2005.