| Honorific-Prefix: | The Honorable |
| Kit Nieto | |
| Office: | Municipal Administrator of Cainta |
| Term Start: | July 2022 |
| Term End: | October 2, 2024 |
| 1Blankname: | Mayor |
| 1Namedata: | Maria Elenita Nieto |
| Office1: | Mayor of Cainta |
| Term Start1: | June 30, 2013 |
| Term End1: | June 30, 2022 |
| 1Blankname1: | Vice Mayor |
| 1Namedata1: | Sofia S. Velasco (2013–2019) Ace B. Servillon (2019–present) |
| Predecessor1: | Mon Ilagan |
| Successor1: | Maria Elenita Nieto |
| Birth Name: | Johnielle Keith Pasion Nieto |
| Birth Date: | 31 January 1969 |
| Party: | Nationalist People's Coalition (2016–present) |
| Otherparty: | United Nationalist Alliance (2013–2016) |
| Relatives: | Jan Nieto (brother) |
| Spouse: | Maria Elenita Nieto |
| Children: | 1 |
| Alma Mater: | Ateneo de Manila University (A.B., LL.B.) |
Johnielle Keith "Kit" Pasion Nieto (born January 31, 1969) is a Filipino lawyer and politician who last served as the municipal administrator of Cainta, Rizal from 2022 to 2024 under the administration of his wife, Mayor Maria Elenita "Ellen" Nieto.[1] He previously served as the mayor of Cainta from 2013 until 2022. He ran for mayor during 2013 elections under United Nationalist Alliance and was proclaimed winner, beating Veron Ilagan, wife of former Mayor Mon Ilagan.[2] He ran again during 2016 elections and 2019 elections under Nationalist People's Coalition and won landslide victories, beating incumbent vice-mayor Sofia Velasco in the latter one.[3] [4] [5] [6] Nieto is seeking a comeback as Cainta mayor in 2025.[7]
Johnielle Keith is the son of medical doctors Rolando Nieto and Ethelyn Pasion with five siblings.[8] His mother was also an undersecretary of the Department of Health, while his brother Jan is a recording artist who competed on Philippine Idol. His other brother Jet was a member of the 1987 and 1988 Ateneo Blue Eagles championship teams.[9]
Nieto graduated from the Ateneo de Manila University with a Bachelor of Arts degree in political science. He attended the Ateneo School of Law for his law degree and was admitted to the bar on March 15, 1994 with Roll No. 39119.[10] [11]
Nieto is the uncle and godfather of professional basketball players, Matt and Mike Nieto, who both played for the Ateneo Blue Eagles until 2019.[12]