Regulations for Title I of the Americans with Disabilities Act (ADA) were issued by the U.S. Equal Employment Opportunity Commission (EEOC).
Regulations for Title II and Title III were issued by the U.S. Department of Justice (DOJ).
Transportation regulations for Title II and Title III were issued by the U.S. Department of Transportation (DOT).
Regulations for Title IV were issued by Federal Communications Commission (FCC).