Don Alonzo Watson (June 15, 1807 – January 1, 1892) was a Rochester, New York businessman and philanthropist who, with Hiram Sibley helped found Western Union.

Don Alonzo Watson was born in Palmer, Massachusetts on June 15, 1807.

In 1832,he moved to Honeoye Falls, New York, where he met Hiram Sibley.

[2] Watson also endowed a professorship to the University of Rochester in acknowledgment of the college's achievements in political science and history.

[3] He died at his home in Rochester on January 1, 1892, and was buried near Sibley in Mount Hope Cemetery.