Clara Y. Lim-Sylianco (18 August 1925 – 23 July 2013[1]) was a Filipino chemist who was granted the title of National Scientist of the Philippines in 1994.

She has published articles, books, and monographs in organic chemistry, biochemistry, genetic toxicology, and molecular nutrition.

However, she switched out of the Medicine track shortly after to pursue a bachelor's degree in chemistry, where she graduated as magna cum laude in 1949.

[1] After receiving a Fulbright scholarship, she went to the United States to pursue her doctoral studies in biochemistry and organic chemistry at the University of Iowa.

She was also dedicated to chemical education and wrote textbooks on organic chemistry and molecular biochemistry that were adopted nationally.