Brooklyn Friends School is a private college preparatory school in Downtown Brooklyn, New York City. Founded by the Religious Society of Friends in 1867, the school enrolls approximately 725 students between the ages of 2 and 18.

Founded in 1867 by the Religious Society of Friends as a coeducational Quaker school, Brooklyn Friends School is one of the oldest continuously operating independent schools in New York City.

Starting as a grade school, BFS added a kindergarten in 1902, a high school division in 1907, and a Preschool and Family Center in 1985 and 1992 respectively. The most recent addition, the BFS Preschool, has gained prominence as one of the city's premier early learning centers.

The Academy Award-winning 1981 documentary Close Harmony chronicled how a children's choir of 4th- and 5th-graders from the school joined with elderly retirees from a Brooklyn Jewish seniors' center to give a joint concert.

In 2000, the school's Head, who had been in the position for ten years, resigned at the request of the board of trustees over allegations of financial mismanagement; audits revealed a deficit of $900,000 for 2000 and $375,000 for 1999. The outgoing Head of School denied any impropriety, and some parents defended his leadership.

The school had about 400 students in 1995 and about 107 teachers in 2000.

The school was founded by the Quakers' Religious Society of Friends. The school and the Quaker meeting ended their affiliation in 2010. Few of the school's modern-day students are Quaker, although the school culture and curriculum incorporate Quaker ideals. The school's charter specifies that half of the board of trustees must be Quaker and one of the two chairs of the board must be appointed by the Quakers.

In 2019, Crissy Cáceres accepted the opportunity to become Head of School, having previously been Assistant Head of School at Georgetown Day School.