Francis B. Loomis (1812–1892) from New London, Connecticut, was an American politician of the Democratic Party who was the 58th lieutenant governor of Connecticut from 1877 to 1879 under Governor Richard D.

Francis Loomis was born in Lyme, Connecticut, on April 9, 1812.

He attended a private school, and upon reaching adulthood, began working in the wool manufacturing business.

He also served as president of the First National Bank in his hometown.

[3] In politics, he was initially a Whig, and then a Republican, but joined the Democratic Party in 1872.