Maryland Route 765 (MD 765) is a collection of state highways in the U.S. state of Maryland. These 26 highways are service roads constructed or old alignments maintained to provide access to private property or county highways whose access was compromised by the realignment of MD 2 and MD 4 in Calvert County. There are six signed mainline segments of MD 765 comprising the old alignment of the concurrency of MD 2 and MD 4 (hereafter referenced as MD 2-4) through Solomons, Lusby, St. Leonard, and Port Republic in southern Calvert County and in the county seat of Prince Frederick. There are also 20 unsigned sections of MD 765 south of Prince Frederick and along MD 2 between its junction with MD 4 in Sunderland and Owings in northern Calvert County.