Recent years have seen approximately one-tenth of graduating seniors recognized by the National Merit Scholarship committee.

The Madrigal Choir, a select group of students auditioned from the full chorus, has attended the Disney Honors festival in Orlando, Florida and has performed with other choirs at such venues as Carnegie Hall and Lincoln Center.

In 2011, the Madrigal Choir received a gold award and came in second place at the Boston Heritage Festival.

Students have the opportunity to take Syracuse University Project Advance (SUPA) Forensic Science.

[7] The school is named for Horace Greeley, the editor of The New York Tribune who made his home in Chappaqua late in life.

Among the diverse offerings are varsity programs in baseball, basketball, bowling, field hockey, football, golf, ice hockey, lacrosse, skiing, soccer, softball, swimming and diving, tennis, track and field, cross country, volleyball, and wrestling.

[8] Their success is due to the training of the year round swimmers on club teams in the area.

[10] Greeley's boys' indoor track and field team won leagues, counties, and sectionals three years in a row, 2022, 2023, and 2024.

Social Studies, Foreign Language, and English classes are all taught in L. There are 4 department offices located in L. L is split into two levels, called Upper L and Lower L. Prior to spring and summer 2020, L had normal size classrooms.

In September 2001, the school received a flurry of press coverage over the football team attending a party where a stripper was hired for entertainment purposes.

[14][15] In 2015, drama teacher Christopher Schraufnagel resigned[16] and was charged with the sexual abuse of three 15-year-old students.