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