Johnathan Hoar (ca 1720–after 1770) was a soldier, judge and political figure in Nova Scotia.
He was born in Concord, Massachusetts, the son of Lieutenant Daniel Hoar, and was educated at Harvard College.
Hoar served with Samuel Waldo during the capture of Louisbourg.
He was named a judge in the Court of Common Pleas in 1762.
According to some sources, Hoar was named governor of Newfoundland but died at sea before assuming that post.