| Ruth Hernandez | |
| Office: | Member of the Philippine House of Representatives from Laguna's 2nd district |
| Predecessor: | Jun Chipeco |
| Office3: | First Lady of Laguna |
| Office4: | Member of the Calamba City Council |
| Birth Name: | Ruth Bayani Mariano |
| Birth Date: | 16 May 1974 |
| Birth Place: | Calamba, Laguna, Philippines |
| Children: | 2 |
| Residence: | Bay, Laguna |
| Alma Mater: | University of the Philippines Los Baños |
| Nationality: | Filipina |
| Party: | Lakas–CMD (1995-2007; 2023–present) |
| Otherparty: | Independent (2018–2021) Nacionalista (2009–2018) PDP–Laban (2007–2009; 2021–2023) |
| Honorific Prefix: | The Honorable |
| Office2: | Member of the Laguna Provincial Board from the 2nd district |
| Termstart: | June 30, 2019 |
| Termstart2: | June 30, 2016 |
| Termend2: | June 30, 2019 |
| Governor3: | Ramil Hernandez |
| Predecessor3: | Girlie Ejercito |
| Term Label3: | Assumed role |
| Termstart3: | May 27, 2014 |
| Termstart4: | June 30, 2007 |
| Termend4: | June 30, 2016 |
| Termstart5: | June 30, 1995 |
| Termend5: | June 30, 2004 |
Ruth Mariano Hernandez (born May 16, 1974) is a Filipina politician and Member of the Philippine House of Representatives of Laguna's 2nd District since 2019.[1] She previously served as board member of Laguna from 2016 to 2019 and councilor of Calamba from 1995 to 2004 and from 2007 to 2016. She is married to the incumbent Laguna Governor Ramil Hernandez, with whom she has 2 daughters.
In 1995, she ran as Member of the Calamba Municipal Council and re-elected in 1998 and in 2001. In 2007, she ran again for the said position and re-elected again in 2010 and in 2013.
In 2016, she ran for Member of the Laguna Provincial Board from the 2nd district.
In 2019, she ran as Member of the Philippine House of Representatives from Laguna's 2nd District and re-elected as congresswoman in 2022.
Mariano-Hernandez married Ramil Hernandez, whom she met as a fellow councilor of Calamba,[2] and have two children.
She finished her undergraduate degree in the University of the Philippines Los Baños.