Daytop, or Daytop Village, is a drug addiction treatment organization with facilities in New York City. It was founded in 1963 in Tottenville, Staten Island by Daniel Harold Casriel along with Monsignor William B. O'Brien, a Roman Catholic priest and founder and president of the World Federation of Therapeutic Communities. Ron Brancato from the Pelham Bay area of Bronx New York, Program Director and former resident of Synanon, California. Synanon was the only other drug rehabilitation program until Daytop Village opened.

Synanon, originally known as Tender Loving Care, was a new religious movement founded in 1958 by Charles E. "Chuck" Dederich Sr. in Santa Monica, California, United States. Originally established as a drug rehabilitation program, Synanon developed into an alternative community centered on group truth-telling sessions that came to be known as the "Synanon Game", a form of attack therapy.