John Alexander (October 21, 1923 – December 8, 1990) was an American operatic tenor who had a substantial career during the 1950s through the 1980s. He had a longstanding relationship with the Metropolitan Opera in New York City, singing with that company every year between 1961 and 1987 for a total of 379 performances. He also periodically performed at the New York City Opera during his career and was a frequent presence at the Philadelphia Lyric Opera Company during the late 1950s and 1960s. Although he spent most of his career in New York City, Alexander occasionally traveled to perform as a guest artist with many of the world's leading opera houses, both in the United States and Europe. He was also an active concert singer throughout his career.