José Frederico d'Assa Castel-Branco (March 5, 1836 - March 5, 1912) was a Goa-born Portuguese military engineer active in Goa in the late 19th century. From 1850 he studied at the Escola Mathemática e Militar de Goa in 1850, after which he joined the Goan-Portuguese Army. Roughly 10 years later, around 1860, his skill as an engineer saw him assigned to the State Engineering Department of Portuguese India. He work transition from Military to Civil engineering. Following the Anglo-Portuguese Treaty of 1878 he began compiling his surveys and the work of others into a large and impressive map of Goa - the finest yet produced. In 1879 he became the Vice-Director of Public Works and Deputy Director of the State Engineers. In 1887, he began teaching engineering at the Escola Profissional e no Liceu de Goa. 1888 saw him promoted to Director General of Public Works of Portuguese India. He retired as a General in 1901, but remained active in the Office of Public Works until about 1905.