John Alexander Clark (1871-1895) was a Mormon missionary that served in various European cities before he unfortunately contracted smallpox and passed away.

John Alexander Clark was born in Farmington, Utah, on 28 February 1871, to Ezra Thompson Clark and Susan Leggett Clark. He graduated from the Brigham Young Academy in Provo, Utah, and taught school in Minersville, Utah. In 1894, he was called to serve an LDS mission to Turkey. He departed for his mission on 3 February 1894. To reach his assigned area he, according to his mission diary, traveled to New York City where he boarded a ship for England. He arrived in Liverpool and traveled to London, Paris, Berlin, Dresden, Leipzig, Prague, Vienna, Belgrade, Constantinople, and Beirut. He remained in Beirut for almost five months where he studied Arabic and German. In August, 1894, he and his missionary companion traveled to Haifa where he continued his missionary activities. In February 1895, Elder Clark contracted smallpox; he died on 8 February 1895 in the home of his landlady. Elder Clark was buried in a cemetery at the foot of Mt. Carmel.