Paul McDonald Calvo (born July 25, 1934) is a Guamanian politician who served as the 3rd Governor of Guam from 1979 to 1983. Before his accession to the governorship, Calvo served as the Guam Legislature from 1971 to 1975. He is a member of the Republican Party of Guam.

Calvo was born in Agaña, Guam, and is the eldest son of Eduardo "Jake" Torres Calvo (1909–1963) and Veronica Mariano McDonald (1913–2009). His only two brothers and two sisters-in-law are Edward (1936–2004), Thomas (1940–2015) and Frances Matias Calvo. His paternal grandparents were Attorney Don Tomas Anderson Calvo and Doña Regina Martinez Torres. His maternal grandparents were John Francis McDonald and Dolores Mariano. He attended George Washington High School in Guam. He then attended the Peacock Military Academy and Santa Clara University.

He embarked on a business career in his family's insurance company in 1958, and entered politics during the 1960s as a member of the Republican Party. He was elected as a senator in the Legislature of Guam in 1965, and during his three terms in the body served as chair of the government Committee on Finance and Taxation and parliamentary leader of the Republican Party. Calvo was elected governor in 1978, and served until 1982.^[1]

During his first year as governor, Calvo reduced the government of Guam's deficit by $27 million, but the deficit continued to climb for the rest of his term due mainly to long-standing problems with tax collections.

Guam's economy began to regain health under Calvo's administration, as he sought to attract new businesses to Guam, including a tuna-fishing fleet, a garment manufacturer, and hotel construction. Visitor arrivals also registered sharp increases.

But Calvo's term as governor was marred by the teacher's strike of 1981, which lasted many months and caused deep divisions in Guam's education system. He lost to Bordallo-Reyes Campaign in the 1982 election and decided to retire from politics. Although he has never run for office since, Calvo remains strongly influential in Republican politics, as its senior statesman, and his son Eddie Baza Calvo was one of the most popular senators in I Liheslaturan Guåhan/the Guam Legislature and was elected governor of Guam in 2010 along with running mate Ray Tenorio.

Calvo's wife is Rose Baza Calvo. They have eight children. Calvo's son Eddie Calvo, is a politician and former Governor of Guam.