Joe Taitano San Agustin (15 October 1930[2] – 15 April 2021) was a Guamanian politician, member of the Democratic Party of Guam.

[4] San Agustin was married to Carmen Santos Shimizu and they had five children, including their many grandchildren and great-grandchildren and great-great-grandchild.

San Agustin first successfully ran as a senator in the Guam Legislature in 1976 and was re-elected 9 times thereafter.

[3] He served as Speaker of the Guam Legislature in 3 successive terms, from 1989 to 1995.

After retiring as a Senator, San Agustin was an adjunct professor at the University of Guam for the School of Business and Public Administration up to 2019.