Angel Chua Alcala ONS (March 1, 1929 – February 1, 2023) was a Filipino biologist who was named a National Scientist of the Philippines in 2014.

He was the Chairman of the Board of Advisers at the Angelo King Center for Research and Environmental Management located in Silliman University.

[1] Alcala published more than 200 peer-reviewed articles and books and his biological contributions to the environment and ecosystems have made him a renowned figure of natural sciences in the Philippines.

[4] Due to his family's financial struggles, they depended on the ocean for its resources either[5] in providing food or items to sell.

[6] During that time, he occasionally assisted in biological fieldwork, for example for Sidney Dillon Ripley and Dioscoro Rabor in 1953 when they collected the only known (as of 2019) specimen of the Negros fruit dove.

He served as secretary of the Department of Environment and Natural Resources from 1992 to 1995 and chairman of the Commission on Higher Education (CHEd) from 1995 to 1999.

Angel Alcala is accredited with many research accomplishments and improvements regarding environmental management, marine conservation, and discovery of new species.

One of Alcala's works consisted of restoring or preserving areas with predominant wild,large predatory fish populations near a small marine sanctuary at Apo Island in the Philippines.

[9] Another research element Alcala incorporated in his study is associating the species’ survival rate of large, predatory fish with available ocean territories around reefs and fisheries.

These findings provide evidence that conservation of these fishes and coral reefs not only slows the species' decline in numbers, but also the growth in habitat for all marine life.

[2] In November 2018, he was awarded Oceans Legend by PEMSEA during the East Asian Seas (EAS) Congress in Iloilo City.