Martha Luz Hildebrandt Pérez-Treviño (La Libertad, January 13, 1925) is a Peruvian linguist and politician. Martha Hildebrandt was the second woman to occupy the Presidency of the Congress of the Republic of Peru in 1999 (Martha Chávez was the first). Since 1995 she has exercised her charge in the Congress of Peru. She is also the sister of César Hildebrandt, a Peruvian journalist.
In 1942 she studied education in National University of San Marcos. In 1952 she studied "Descriptive Linguistics" in Oklahoma, United States and subsequently "Structural Linguistics" in Illinois, also in the United States.
From 1947 to 1953, she worked at the National University of San Marcos as a teacher. Then she traveled to Venezuela, where she worked in the area of linguistics at the Department of Justice of Venezuela. In 1962 she returned to the National University of San Marcos as professor and remained there until 1973. From 1972 until 1976 she was also the General Director of the Institute of Culture.
From 1974 to 1978 she held important positions in the Organization of American States (OAS) and in UNESCO, in the area of linguistics.
Martha Hildebrandt may be the local linguist best known to the broad Peruvian public, though she speaks neither Quechua nor Aymara. She was Perpetual Secretary of the Academia Peruana de la Lengua from 1993 to the 2005. Her numerous books on subjects related to the Spanish Language are extensively quoted.
Her political life began in 1994 with her (professional) relationship with Alberto Fujimori. In the general elections of 1995 she was chosen by Cambio 90-Nueva Mayoría as the Congressperson of the Republic, initiating her first period in the Legislature. When the general elections of the 2000 approached and Alberto Fujimori desired to advance to the re-reelection, she defended the controversial project, along with Martha Chávez, Luz Salgado and Carmen Lozada.