Widely known as the "Angel of Khlong Toei" or "Slum Angel", Prateep Ungsongtham Hata is a Thai activist who has attracted the national attention for her work with slum dwellers in the Khlong Toei District of Bangkok, Thailand. She served as the Secretary General of the Duang Prateep Foundation and became one of the leaders of the 1992 oppositional movement before being elected to the Senate, representing Bangkok. She honorably garnered the Ramon Magsaysay Award for Public Service in 1978 and The World's Children's Prize for the Rights of the Child from Queen Silvia of Sweden in 2004.
Prateep Ungsongtham was born to her father, a fisherman immigrated from China and her mother, a Thai woman in a slum in Bangkok's Klong Toei district. She did not have a chance to be admitted to a public school due to her family’s illegally erected home. She dropped out of school and worked on the docks of the Bangkok port to support her parents. She opened her own One Baht a Day School at her home and then received donations from private individuals, foreign embassies and the Bangkok Bank.
She got married the Japanese citizen Mr. Tatsuya Hata in 1987.