Manuel Alonso Martínez (1827, Burgos – 1891, Madrid) was a Spanish jurist and politician, and the principal redactor of the Spanish Civil Code of 1888/89.
After working as a Burgos attorney, he entered public service in 1854 as a member of the Cortes. Serving as the minister for development, governor of Madrid, minister of finance and minister of justice in the time of 1855 to 1888, he was instrumental in pursuing the codification of Spanish civil law.
His widow, Doña Demetria Martín y Baraya, received in 1891 the title of Marchioness of Alonso Martínez.