Morton DaCosta (1914–1985) was an American musical theater director and producer, best known for his work on Broadway. He was not a performing artist but played a critical role in shaping musical productions during the mid-20th century. DaCosta's most notable works include the original Broadway productions of "The Music Man" (1957), which won multiple Tony Awards, and "Mame" (1966), featuring Angela Lansbury in a defining role. His directorial style emphasized strong character development and engaging storytelling, which helped elevate the musical genre during a transformative period in American theater. DaCosta also directed the film adaptation of "Mame" in 1974, further extending his influence beyond the stage. Though primarily recognized for his contributions to musical theater, DaCosta's impact also resonated in the way he integrated popular music and theatrical performance, paving the way for future productions that blend various artistic forms. His work remains influential in the landscape of American musical theater, highlighting the importance of direction and production in creating enduring theatrical experiences.