Ida is a surname. Notable people with the surname include:
- Antoinette Nana Djimou Ida (born 1985), French-Cameroonian heptathlete
- Erika Ida (井田 恵里香, born 1994), Japanese cricketer
- Ibrahim M. Ida (born 1949), Nigerian politician
- James Ida (born 1940), New York gangster
- Joseph Ida (1890–?), American gangster and head of the Philadelphia mob in the 1940s and 1950s
- Masataka Ida (井田 正孝, 1912–2004), Japanese lieutenant colonel who conspired to overthrow the government near the end of World War II
- Rina Ida (井田 莉菜, born 1991), Japanese curler
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