Children's Aid, formerly the Children's Aid Society, is a private child welfare nonprofit in New York City founded in 1853 by Charles Loring Brace. With an annual budget of over $100 million, 45 citywide sites, and over 1,200 full-time employees, Children's Aid is one of America's oldest and largest children's nonprofits.

Charles Loring Brace was an American philanthropist who contributed to the field of social reform. He is considered a father of the modern foster care movement and was most renowned for starting the Orphan Train movement of the mid-19th century, and for founding Children's Aid Society.