Lawrenceville was additionally formerly a member of the G20 Schools group.
The school has been accredited by the Middle States Association of Colleges and Schools Commission on Secondary Schools since 1928.
In its 2015 rankings the year before, Business Insider had ranked the school's tuition as the 2nd most expensive private high school tuition in the United States, with tuition and fees of ,700 behind the ,092 charged by Connecticut's Salisbury School.
In the publication's five years of rankings, that was the first time Lawrenceville was not the top-ranked school.
As early as 1828, the school attracted students from Cuba and England, as well as from the Cherokee Nation.
It had several names, including the Lawrenceville Classical and Commercial High School, the Lawrenceville Academy, and the Lawrenceville Classical Academy, before its current name, "The Lawrenceville School," was adopted during its refounding in 1883.
This portion, the old campus area built in 1894–1895, was designed jointly by the landscape designer Frederick Law Olmsted and the architects Peabody & Stearns. The village has historically been an active commercial center for students.In 1999, the student body elected a female president, Alexandra Petrone; in 2003, Elizabeth Duffy was appointed the School's first female headmaster; and in 2005, Sasha-Mae Eccleston, Lawrenceville Class of 2002 and Brown University Class of 2006, became Lawrenceville's first alumna to win a Rhodes Scholarship.Lawrenceville was also formerly the world record holder for the largest custard pie fight.Other student-run publications include The First Amendment, a monthly political magazine founded in 2010; LMAG, a semesterly fashion magazine; The Contour, a newspaper on global issues; The Lawrenceville Historical Review, the school's annual history periodical; El Artículo, a Spanish publication, and The Lit, a literary magazine published three times a year.The Lit was founded in 1895 by author Owen Johnson, who went on to write the Lawrenceville Stories.