Manuel Olaguer Feliú (27 December 1759 – 7 June 1824) was a Spanish military engineer known for his role in constructing and overhauling fortifications in Colonial Chile as well as his later participation in the Chilean and Peruvian wars of independence.

He was born on December 27, 1759, in Ceuta although descended from Catalans and was first cousin of Antonio Olaguer Feliú, Viceroy of the Rio de la Plata and Secretary of War of the King of Spain, Carlos IV.

[13][14] The viceroy of Peru sent him on the Frigate Thomas, on an expedition in aid of the royal army of General Antonio Pareja, for the recovery of Chile, but was captured with other leaders in Talcahuano (1813).

He held several public offices, including the Junta convened by Francisco Casimiro Marcó del Pont, last Captain General of Chile.

[19] On August 10, 1816, President Marcó del Pont commissioned him to find and organize a place to Campus Martius, to instruct the troops.

[21] Between 1818 and 1822, Field Marshal Manuel Olaguer Feliu, as Director of the Royal Engineers and Deputy Inspector of the Viceroyalty of Peru, joined the War Council (Junta de Guerra in Spanish) chaired by the Viceroy Pezuela.

Later, he was appointed by the Viceroy of La Serna as Deputy of the council of Pacification of the Peru, where they tried with General José de San Martín the conditions of surrender of El Callao.