Jaanus is an Estonian masculine given name, a version of John.
People named Jaanus include:
Jaanus Gross (born 1975), Estonian recurve archer
Jaanus Kuum (1964–1998), Estonian-Norwegian cyclist
Jaanus Nõmmsalu (born 1981), Estonian volleyball player
Jaanus Silla (born 1969), Estonian-American film director and missionary
Jaanus Sirel (born 1975), Estonian footballer
Jaanus Tamkivi (born 1959), Estonian politician
Jaanus Uudmäe (born 1980), Estonian triple jumper
Jaanus Veensalu (born 1964), Estonian footballer
