Harbor attended Maryland men's basketball's game against Illinois in College Park.
The Terps also picked up a commit in football and two in baseball.
The Terps also earned the commitment of two class of 2024 gymnasts.
The Terps's 2023 class is ranked No. 9 by ESPN, and a host of other programs announce signees that are set to join teams next year.
The Terps commit fielded college offers in both football and basketball.
Harbor is touted as one of the top high school football players from Washington, D.C.
Maryland men's basketball hasn't landed a five-star recruit in six years.
Spencer Ford Jr. was surrounded by lacrosse from a young age, as his father played professionally.
Darren Harris selected the Terps, Duke, Miami and Ohio State as he narrowed down his list. Maryland football also extended offers to multiple players.
Peter Laake joins a highly-rated 2024 recruiting class for the Terps.