Prateep Ungsongtham Hata (; ; born 9 August 1952) is a Thai activist noted for her work with slum dwellers in the Khlong Toei District of Bangkok, Thailand. Among her supporters, she is known as Khru Prateep ("Teacher Prateep"), the "Angel of Khlong Toei" or "Slum Angel". She was awarded the Ramon Magsaysay Award for Public Service in 1978, founded and became the Secretary General of the Duang Prateep Foundation. She was one of the leaders of the 1992 oppositional movement. In 2000, she was elected to the Senate, representing Bangkok. Life Prateep Ungsongtham was born in a slum in Bangkok's Klong Toei district. Her father was a fisherman immigrated from China, her mother was Thai. As her parents lived in an illegally erected home, she had no birth certificate and was denied admission to a public school. For four years she could visit a relatively cheap private school. She had to drop out when she was 12 years old and her parents ran out of money. She started working on the docks of the Bangkok port, packing firecrackers and scraping rust off ships' hulls. She saved money from her meagre wages (about one baht per day) and at 15 she was able to pay for secondary education at an evening school. Because most slum children, like her, could not go to a regular school, Prateep opened her own One Baht a Day School at her home. She spent much time helping children and their families to cope with the conditions of slum life. When the slum dwellers were threatened with eviction by the Port Authority of Thailand (PAT) which wanted to expand its facilities in 1972, a Bangkok Post reporter interviewed Prateep and her cause was publicly known. Her school received donations from private individuals, foreign embassies and the Bangkok Bank. Thammasat University students came to support her as voluntary teachers. Eventually, the PAT had to agree to a compromise solution and made a new site available 1 km away. In 1974, the school opened a real school building, and in 1976 it was officially recognised by the Bangkok Metropolitan Administration, which also revised its policy towards children without birth certificate. In the same year, Prateep received her diploma of education from Suan Dusit Teachers College. In 1978 Prateep received the Ramon Magsaysay Award for Public Service. She used the prize money to establish the Duang Prateep Foundation (DPF;