Jupiter is the northernmost town in Palm Beach County, Florida, United States. According to the 2020 US Census, the town had a population of 61,047. It is 84 miles north of Miami and 15 miles north of West Palm Beach. Along with the adjacent Village of Tequesta, Jupiter is considered the northernmost municipality in the Miami metropolitan area. It was named the 9th Best Southern Beach Town to live in by Stacker Newsletter for 2022, was rated as the 12th Best Beach Town in the United States by WalletHub in 2018, and as the 9th Happiest Seaside Town in the United States by Coastal Living in 2012.

The area where the town now sits was originally named for the Hobe Indian tribe which lived at the mouth of the Loxahatchee River and whose name is also preserved in the name of nearby Hobe Sound. A mapmaker misunderstood the Spanish spelling Jobe of the native people name Hobe and recorded it as Jove. Subsequent mapmakers further misunderstood this to be the name of the Roman god Jupiter, because the declension of the word Jupiter in Latin includes the root Jov- in all cases but the nominative case and vocative case. They, therefore, adopted the more familiar name of Jupiter. The god Jupiter (or Zeus in the Greek mythology) is the chief Roman god, and the god of light, of the sky and weather, and of the state and its welfare and laws. Jupiter's consort was Juno, inspiring a neighboring town to name itself Juno Beach.

The Battles of the Loxahatchee took place near the site of Jupiter during the Seminole Wars in 1838. The most notable landmark is the Jupiter Inlet Lighthouse, completed in 1860. Made of brick, it was painted red in 1910 to cover discoloration caused by humidity. Hurricane Jeanne in 2004 sandblasted the paint from the upper portion of the tower, and the tower was repainted using a potassium silicate mineral coating. The lighthouse often is used as the symbol for Jupiter.