Carlos Coimbra da Luz (Portuguese: [ˈkaʁlus koˈĩbrɐ da ˈlus]; 4 August 1894 – 9 February 1961) was a Brazilian politician, lawyer, teacher and journalist who served as acting president of Brazil from November 8 to November 11, 1955.

After the political crisis following the Getúlio Vargas suicide in 1954, Carlos Luz was the second of three presidents who ruled Brazil in a brief period of 16 months.

Luz headed the government only three days in November 1955 and was replaced, as part of the 1955 Brazilian coup d'état, by the vice-president of the Senate Nereu Ramos on the orders of the Minister of Defence Henrique Teixeira Lott over his fear that Luz might support a plot to prevent President-elect Juscelino Kubitschek from taking office in January 1956.

[2] Luz was removed by Congress, under pressure by the military, declaring him unable to fulfill his duties.

As of 2023, Luz remains the shortest-serving president of Brazil.