Ivy Preparatory School League

The Ivy Preparatory School League is a high school athletic conference of preparatory schools in New York City and its suburbs. The Ivy Preparatory School League has no affiliation with the Ivy League universities.

Members
The league comprises the following schools:
 * Collegiate School in Manhattan
 * Dalton School in Manhattan
 * Hackley School in Tarrytown, Westchester County
 * Ethical Culture Fieldston School in Riverdale, Bronx
 * Horace Mann School in Riverdale, Bronx
 * Poly Prep in Brooklyn, New York
 * Riverdale Country School in Riverdale, Bronx
 * Trinity School in Manhattan

Former members

 * Adelphi Academy in Brooklyn
 * New York Military Academy in Cornwall, Orange County
 * St. Paul's School in Garden City, Nassau County, now closed
 * The Stony Brook School in Brookhaven, Suffolk County

Sports offered
The league offers competition in the following sports:

Fall sports
 * Cross country (boys)
 * Cross country (girls)
 * Field hockey (girls)
 * Soccer (boys)
 * Soccer (girls)
 * Tennis (girls)
 * Volleyball (girls)
 * Water Polo(coed)

Winter sports
 * Basketball (boys)
 * Basketball (girls)
 * Indoor track (boys)
 * Indoor track (girls)
 * Squash
 * Swimming (boys)
 * Swimming (girls)
 * Wrestling (boys)

Spring sports
 * Baseball (boys)
 * Golf
 * Lacrosse (boys)
 * Lacrosse (girls)
 * Outdoor track (boys)
 * Outdoor track (girls)
 * Softball (girls)
 * Tennis (boys)
 * Ultimate Frisbee (boys)
 * Ultimate Frisbee (girls)

Not all member schools compete in all sports. Collegiate School is an all-boys school.

Notable athlete alumni
High school graduation year is in parentheses.

Collegiate
 * Ian McGinnis (1997), basketball, NCAA-leading rebounder at Dartmouth

Hackley
 * Danya Abrams (1993), basketball, three-time All-Big East first-team at Boston College

Horace Mann
 * Pedro Álvarez (2005), baseball, Pittsburgh Pirates and others
 * Harrison Bader (2012), baseball, New York Yankees and others
 * Kimberly Belton (1976), basketball, member of the Stanford Athletic Hall of Fame and 1980 draft choice of the Phoenix Suns
 * Bethany Donaphin (1998), basketball, New York Liberty

Poly Prep
 * Joakim Noah (2004, from Lawrenceville School), basketball, Chicago Bulls and others
 * Brian Flores (1999), football, Boston College, Head Coach for Miami Dolphins
 * Isaiah Wilson (2017), football Tennessee Titans, Offensive Lineman

Riverdale
 * Calvin Hill (1965), football, Dallas Cowboys and others
 * Tim Morehouse(1996), fencing, United States Fencing Team, 2 time team olympian, team silver medalist in Beijing 2008

Trinity
 * John McEnroe (1977), tennis
 * Patrick McEnroe (1984), tennis

Ethical Culture Fieldston School
 * Gus Ornstein