Eligibility

According to the Elective Governors Act:

"No person shall be eligible for election to the office of Governor or Lieutenant Governor unless he/she is an eligible voter and has been for five consecutive years immediately preceding the election a citizen of the United States and a bona fide resident of Guam and will be, at the time of taking office, at least thirty years of age. The Governor shall maintain his/her official residence in Guam during his/her incumbency.^[2]"

To be eligible, a candidate for Governor of Guam must:

• an eligible voter of Guam
• a United States citizen
• at least thirty years of age.
• has lived in Guam for five years, preceding the general election.

Election

According to the Elective Governor Acts of 1968, the Governor of Guam, together with the Lieutenant Governor, shall be elected by a majority of the votes cast by the people who are qualified to vote for the members of the Legislature of Guam. The Governor and Lieutenant Governor shall be chosen jointly, by the casting by each voter of a single vote applicable to both offices. The first election for Governor and Lieutenant Governor was held on November 3, 1970, with the election of Governor Carlos Camacho and Lt. Governor Kurt Moylan. Beginning in 1974, Guam's Governor and Lieutenant Governor is elected by direct vote, on the first Tuesday of November. The Governor and Lieutenant Governor shall hold office for a term of four years and until their successors are elected and qualified.

Inauguration

The Governor of Guam usually takes the oath of office on the first Monday of January. In past inaugurations, however, the governor-elect and lieutenant governor-elect would take the oath of office past midnight on Monday morning.

Traditionally, the lieutenant governor-elect takes the oath first and delivers his inaugural remarks, followed then by the incoming governor-elect. As soon as the governor takes the oath of office, four ruffles and flourishes are played then followed by "The Stars and Stripes Forever" and a 21-gun salute. The newly inaugurated governor delivers his inaugural address, an opportunity for the new leader to state his goals for the next 4 years.

Oath of office

Pursuant to the Guam Organic Act, the governor's term of office begins at midnight on the first Monday of January of the year following the election. The day marks the beginning of the four-year term of the Governor and Lieutenant Governor of Guam. Before executing the powers as the Governor of Guam, the governor must take an oath of office:

I, (name), duly elected Governor of Guam, do solemnly swear, in the presence of the Almighty God, that I will well and faithfully support the Constitution of the United States, the laws of the United States applicable to Guam, and the laws of Guam, and that I will conscientiously and impartially discharge my duties as the Governor of Guam.

In line with traditional oath-takings, governors have traditionally palmed a Bible and have added, "So help me God!" at the end of their oaths. The Governor of Guam is sworn in by the Chief Justice of Guam.

Spanish era

In 1565, Miguel López de Legazpi formally declared Spanish sovereignty over the Mariana Islands. However, there was no permanent Spanish presence on the island and it was ruled from the Philippines as part of the Spanish East Indies by the Governor-General of the Philippines.^[3]: 3 Diego Luis de San Vitores established a mission on Guam in 1668, but Francisco de Irrisari was the first person to take the title "Governor" in June 1676, amidst the Spanish-Chamorro Wars. Antonio de Saravia, who arrived in June 1681, was the first to receive his appointment as governor from the Spanish throne, meaning that, technically, he was no longer subordinate to rule from the Philippines or Mexico.

American capture of the territory (1898)

Image	Name	Term start	Term end
	Henry Glass, Admiral	June 12, 1898	June 22, 1898
	Francisco Martínez Portusach	June 22, 1898	December 12, 1898

Political instability (1898–1899)

Image	Name	Term start	Term end	Notes
	José Sisto	December 12, 1898	December 31, 1898	overthrew Portusach
	Venancio Roberto	December 31, 1898	January 2, 1899	overthrew Sisto
	José Sisto	January 2, 1899	February 1, 1899	put back in power by US Navy
	Edward D. Taussig	February 1, 1899	February 13, 1899	re-asserted USN authority, put a local council in place
	Don Joaquin Perez y Cruz	February 13, 1899	April 20, 1899	local council
	William Coe	April 20, 1899	May 9, 1899	local council
	Louis A. Kaiser	May 9, 1899	August 7, 1899	local council

American Naval governors (1899–1941)

#	Image	Name	Term start	Term end
1		Richard Phillips Leary	August 7, 1899	July 12, 1900
–		William Edwin Safford Acting	June 12, 1900	July 19, 1900
2		Seaton Schroeder	July 12, 1900	January 25, 1903
–		William Swift Acting	January 25, 1903	February 6, 1903
3		William Elbridge Sewell	February 6, 1903	May 16, 1904
–		Frank Herman Schofield Acting	January 11, 1904	January 28, 1904
–		Raymond Stone Acting	January 28, 1904	May 16, 1904
4		George Leland Dyer	May 16, 1904	November 2, 1905
5		Luke McNamee	November 2, 1905	December 3, 1906
6		Templin Morris Potts	December 3, 1906	October 3, 1907
–		Luke McNamee Acting	October 3, 1907	December 28, 1907
7		Edward John Dorn	December 28, 1907	November 5, 1910
8		Frank Freyer	November 5, 1910	January 21, 1911
9		George Salisbury	January 21, 1911	January 30, 1912
10		Robert Edward Coontz	January 30, 1912	September 23, 1913
11		Alfred Walton Hinds	September 23, 1913	March 28, 1914
12		William John Maxwell	March 28, 1914	April 29, 1916
–		William P. Cronan Acting	April 29, 1916	May 18, 1916
–		Edward E. Simpson Acting	May 18, 1916	May 30, 1916
13		Roy Campbell Smith	May 30, 1916	November 18, 1918
14		William Gilmer	November 18, 1918	November 22, 1919
–		William A. Hodgman	November 22, 1919	December 21, 1919
15		William Gilmer	December 21, 1919	July 7, 1920
16		Ivan Wettengel	July 7, 1920	February 27, 1921
17		James Sutherland Spore	February 27, 1921	February 7, 1922
–		Adelbert Althouse Acting	February 7, 1922	December 8, 1922
–		John P. Miller Acting	December 8, 1922	December 14, 1922
18		Adelbert Althouse	December 14, 1922	August 4, 1923
19		Henry Bertram Price	August 4, 1923	August 26, 1924
20		Alfred Winsor Brown	August 26, 1924	August 7, 1926
23		Lloyd Stowell Shapley	August 7, 1926	June 11, 1929
24		Willis W. Bradley	June 11, 1929	March 15, 1931
25		Edmund Root	March 15, 1931	June 21, 1933
26		George A. Alexander	June 21, 1933	March 27, 1936
27		Benjamin McCandlish	March 27, 1936	February 8, 1938
28		James Thomas Alexander	February 8, 1938	April 20, 1940
29		George McMillin	April 20, 1940	December 10, 1941

Japanese military governors (1941–1944)

Name (Birth–Death)		Took office	Left office
	Tomitarō Horii (1890–1942)	December 10, 1941	January 1942
	Hayashi Hiromu	January 1942	June 1942
	Homura Teiichi	June 1942	March 1944
	Takeshi Takashina (1891–1944)	March 1944	July 28, 1944
	Hideyoshi Obata (1890–1944)	July 28, 1944	August 11, 1944

American military governors (1944–1949)

Name (Birth–Death)		Took office	Left office
	Roy Stanley Geiger (1885–1947)	July 21, 1944	August 10, 1944
	Henry Louis Larsen (1890–1962)	August 10, 1944	May 30, 1946
	Charles Alan Pownall (1887–1975)	May 30, 1946	September 27, 1949

Appointed civilian governors (1949–1971)

#	Governor (Birth–Death)			Took office	Left office	Appointed by	Acting Governor
1			Carlton Skinner (1913–2004)	September 17, 1949	April 22, 1953	Harry S. Truman	Randall Herman (February 20, 1953 – April 22, 1953)
2			Ford Quint Elvidge (1892–1980)	April 23, 1953	October 2, 1956	Dwight D. Eisenhower	William T. Corbett (May 19, 1956 – October 2, 1956)
3			Richard Barrett Lowe (1902–1972)	October 2, 1956	July 9, 1960		Marcellus Boss (November 14, 1959 – August 22, 1960)
4			Joseph Flores (1900–1981)	July 9, 1960	May 20, 1961
5			William Partlow Daniel (1915–2006)	May 20, 1961	March 9, 1963	John F. Kennedy	Manuel Flores Leon Guerrero (January 20, 1963 – March 9, 1963)
6			Manuel F. Leon Guerrero (1914–1985)	March 9, 1963	July 20, 1969
7			Carlos Camacho (1924–1979)	July 20, 1969	January 4, 1971	Richard Nixon

Elected governors (1971–present)

Democratic (4)       Republican (5)
Governor				Served	Party	Elected	Previous Office	Lieutenant Governor
1			Carlos Camacho (1924–1979)	January 4, 1971 – January 6, 1975 (lost election)	Republican	1970	Appointed Governor of Guam		Kurt S. Moylan
2			Ricardo Bordallo (1927–1990)	January 6, 1975 – January 1, 1979 (lost election)	Democratic	1974	Senator of the Guam Legislature		Rudolph G. Sablan
3			Paul McDonald Calvo (1934–)	January 1, 1979 – January 3, 1983 (lost election)	Republican	1978	Senator of the Guam Legislature		Joseph F. Ada
4			Ricardo Bordallo (1927–1990)	January 3, 1983 – January 5, 1987 (lost election)	Democratic	1982	Senator of the Guam Legislature		Edward Diego Reyes
5			Joseph F. Ada (1943–)	January 3, 1987 – January 2, 1995 (lost election)	Republican	1986 1990	Lieutenant Governor of Guam		Frank F. Blas
6			Carl T.C. Gutierrez (1941–)	January 2, 1995 – January 6, 2003 (lost re-nomination)	Democratic	1994 1998	Senator of the Guam Legislature		Madeleine Bordallo
7			Felix J. Perez Camacho (1957–)	January 6, 2003 – January 3, 2011 (term limited)	Republican	2002 2006	Senator of the Guam Legislature		Kaleo Moylan
									Michael Cruz
8			Eddie J. Baza Calvo (1961–)	January 3, 2011 – January 7, 2019 (term limited)	Republican	2010 2014	Senator of the Guam Legislature		Ray Tenorio
9			Lou Leon Guerrero (1950–)	January 7, 2019 – Incumbent	Democratic	2018 2022	Senator of the Guam Legislature		Josh Tenorio