The Q4 bus route constitutes a public transit corridor running along Merrick Boulevard and the easternmost portion of Linden Boulevard in southeastern Queens, New York City. The route runs from the Jamaica Center–Parsons/Archer station to Cambria Heights near the Queens–Nassau County border. The Q4 also provides limited-stop service along the corridor during peak weekday hours. The route is now operated by MTA Regional Bus Operations under the New York City Transit brand.