Luís Manuel Gonçalves Marques Mendes GCIH (born 5 September 1957) is a Portuguese lawyer and politician, and a former Leader of the Social Democratic Party.

He is a son of António Marques Mendes and wife Maria Isabel Gonçalves.

As a member of the Social Democratic Party he became Secretary of State and Spokesman of the Government of Prof. Aníbal Cavaco Silva.

[2] He was elected the President of his Party in 2005 after Pedro Santana Lopes and was succeeded in September 2007 by Luís Filipe Menezes.

He married in Guimarães, Vermil, on 24 April 1982, to Rosa Sofia Pinto Martins Salazar, born in Guimarães, Vermil, on 8 May 1957, a Licentiate in Modern Literatures and Languages (English and German), daughter of António Martins Fernandes Salazar (b. Guimarães, Vermil, Calçada, 19 May 1931), an Industrialist, one of the pioneers of the Ave, Subregion industrialization, and wife (m. Vila do Conde, São Miguel de Arcos, 21 April 1955) Berta da Silva Pinto (Penafiel, Penafiel, 23 May 1934 – Guimarães, Creixomil, 13 February 1995), and paternal granddaughter of José Fernandes Salazar (Guimarães, Vermil, 3 March 1890 – Porto, Miragaia, 1 December 1975), an Industrialist, one of the pioneers of the Ave, Subregion industrialization, and wife (m. Guimarães, Ronfe, 19 February 1925) Rosa Correia da Silva Martins (Guimarães, Ronfe, 2 January 1897 – Porto, Cedofeita, 31 August 1972).