Walter Roger Martos Ruiz (11 February 1957 – 7 January 2025) was a Peruvian military general and politician who briefly served as Prime Minister of Peru from August to November 2020, under President Martín Vizcarra's administration.

[5] On 3 October 2019, as a retired general, Martos was sworn in as Minister of Defense, as part of the cabinet led by Vicente Zeballos, of the Martín Vizcarra administration.

He succeeded retired Vice Admiral Jorge Moscoso in said position, as part of the cabinet renewal following the dissolution of the Peruvian Congress four days prior.

[6] Following the congressional denial of confidence against Pedro Cateriano's cabinet, President Martín Vizcarra appointed Martos as Prime Minister of Peru on 6 August 2020.

[7] After three months in office, Martos resigned alongside his cabinet following the impeachment and removal of President Vizcarra, on 9 November 2020.