Professor Theraphan Luangthongkum (Thai: ธีระพันธ์ เหลืองทองคำ; also cited variously as L-Thongkum, L. Thongkum or Thongkum in publications) is a Thai linguist, specializing in phonetics, linguistic fieldwork, lexicography and minority languages of Southeast Asia. She is currently a faculty member of the Department of Linguistics, the Faculty of Arts, Chulalongkorn University, Thailand.

In 2010 she was awarded an honorary membership by the Linguistics Society of America,^[1] making her the first Thai linguist to receive this honor.

Prof. Luangthongkum graduated from the Faculty of Arts, Chulalongkorn University in 1968 with a BA (2nd class honors) in English. She then went to the University of California at Davis, where she received her MA in linguistics in 1970. With a scholarship from the Ford Foundation, she furthered her studies in phonetics at the University of Edinburgh, where she obtained her Ph.D. in 1977 presenting the thesis 'Rhythm in standard Thai'.^[2]

• Distinguished Researcher Award (Humanities), National Research Council of Thailand (NRCT), 2002.
• Outstanding Research Award (Humanities), National Research Council of Thailand (NRCT), 2002.
• Distinguished Professor Award (Humanities), Chulalongkorn University, 2003.
• Distinguished Professor Award, The Eakin Laugesen Memorial Fund, 2006.
• Distinguished Research Award, the Academic Affairs Section, the Thailand Research Fund (TRF), 2007.