| Honorific-Prefix: | The Honorable |
| Casimiro Ynares III | |
| Office: | Mayor of Antipolo |
| Term Start: | June 30, 2022 |
| 1Blankname: | Vice Mayor |
| 1Namedata: | Josefina Gatlabayan |
| Predecessor: | Andrea Bautista-Ynares |
| Term Start2: | June 30, 2013 |
| Term End2: | June 30, 2019 |
| 1Blankname2: | Vice Mayor |
| 1Namedata2: | Ronaldo Leyva (2013-2016) Josefina Gatlabayan (2016-2019) |
| Predecessor2: | Danilo Leyble |
| Successor2: | Andrea Bautista-Ynares |
| Order3: | 21st |
| Office3: | Governor of Rizal |
| Term Start3: | June 30, 2007 |
| Term End3: | June 30, 2013 |
| Predecessor3: | Casimiro Ynares Jr. |
| Successor3: | Rebecca Ynares |
| Birth Name: | Casimiro Alcantara Ynares III |
| Birth Date: | March 4, 1973 |
| Party: | NPC |
| Spouse: | Andrea Bautista-Ynares |
| Relations: | Nina Ynares (sister) Consuelo Ynares-Santiago (aunt) Bong Revilla (brother-in-law) Ramon Revilla Sr. (father-in-law) |
| Children: | 3 (1 deceased) |
| Parents: | Casimiro Ynares Jr. Rebecca Ynares |
| Profession: | Physician |
| Occupation: | Politician |
Casimiro "Jun" Alcantara Ynares III (born March 4, 1973) is a Filipino physician and politician who is the mayor of Antipolo from 2013 to 2019 and since 2022.[1] He previously served as the Public Information Officer of the city under his wife, former Mayor Andrea Bautista-Ynares, and the governor of Rizal from 2007 to 2013.[2] [3]
Ynares is the son of former governors Casimiro Ynares Jr. and Rebecca Ynares. He is the brother of Governor Nina Ricci Ynares.
Ynares graduated from De La Salle University – Dasmariñas with a degree of Bachelor of Science in Biology Major in Medical Biology.
On January 30, 2024, he signed a memorandum of usufruct agreement to allow the construction of a DSWD Satellite Office for Calabarzon in the city. 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. He added that the office would also have a warehouse that would store readily available food and non-food packs that could be deployed during calamities and crises. The said office will serve as an extension arm of the DSWD Region IV-A.[4]
He is married to Andrea Bautista-Ynares,[5] who also became mayor of Antipolo for one term. She is the daughter of former senator Ramon Revilla Sr., and sister of actor and incumbent senator Bong Revilla.[6] They have three children: Audrey Ann (deceased),[7] Cassandra Danielle, and Rebecca Victoria.