Léman Manhattan was formerly member of the Athletic Conference of Independent Schools (ACIS) and the New York State Association for Independent Schools (NYSAIS).
Now Léman Manhattan is a member of the Independent Schools Athletic Association (ISAA) and the Independent Schools Athletic League (ISAL). Léman Manhattan’s Boys and Girls Varsity Basketball won the ACIS conference in 2015-2016.
Leman Manhattan as of 2016 has two varsity basketball players that have scored over 1,000 points during their high school career those players being Aleiyah Springer (2012-2016) and Deondre Bourne (2013-2017).
Deondre Bourne has recorded the most points for Léman Manhattan with a record high of 2,100 points. Their new Athletic Director, Keith Sequira has run their athletic department since the middle of 2014-15 after the departure of former Athletic director Ray Lacen.