Ida Isabel Alligier (September 27, 1879 – November 30, 1989) was an American verified supercentenarian. She was born in Hampshire County, Massachusetts, to parents Clement Charles Alligier and Anne Elizabeth Alligier. Clement immigrated from France when he was 17 years old.
She worked as a cook in a boarding school in Lapwai, Idaho. She eventually quit her job when her parents needed caring. Her parents and four of her siblings lived to be 90+. She never married. Her height, when aged, was 4 feet 8 inches tall. She was still physically active well into her 90s. Alligier died on November 30, 1989, at the age of 110 years, 64 days.