- Location: Jupiter, FL
- League: Florida State League 1998-2019; Low-A Southeast 2021-
- Affiliation: Montreal Expos 1998-2001; Florida Marlins/Miami Marlins 2002-present
- Ballpark: Roger Dean Chevrolet Stadium
The Jupiter Hammerheads, formerly of the Florida State League and now in Low-A Southeast, are owned by their parent Miami Marlins. They play their home games at Roger Dean Chevrolet Stadium, which they share with the Palm Beach Cardinals of the same league.
The brand debuted in 1998, but the franchise dates all the way to the 1965 West Palm Beach Braves. That farm club changed parent cities - but not teams - in 1966 when the Milwaukee Braves moved to Atlanta. The next change was more complete and would last the rest of their time in West Palm: they became the expansion Montreal Expos' High-A team in 1969 as the West Palm Beach Expos.
In Jupiter, the 'Heads continued under the Expos from 1998 through 2001, then moved into the then-Florida Marlins' system in 2002. That exchange was part of a much larger transaction, in which Jeffrey Loria sold the flailing Expos to Major League Baseball and used the resulting money and leverage to buy the Marlins, but also got to keep some of the Expos' more valuable assets, including this farm team and a share of its ballpark. When the dust settled, the Marlins had the Jupiter affiliation and the Expos' High-A affiliation went to the Brevard County Manatees, a struggling team that had served as the Marlins' affiliate in the FSL. In effect, although not technically, the Expos and Marlins swapped Florida operations and High-A clubs, with the Expos getting the short end of the stick.