Supplejack is a common name for several plants and may refer to:

• Plants in the family Flagellariaceae:
  • Supplejack, Flagellaria indica a bamboo–like vine plant species native to eastern and northern Australia
• Plants in the family Rhamnaceae:
  • Paniculous supplejack, Berchemia racemosa, a climbing plant native to east Asia
  • Alabama supplejack, Berchemia scandens, a climbing plant native to central and southern parts of the United States
  • Supplejack tree, Ventilago viminalis, a tree native to Northern and Central Australia
• Plants in the family Ripogonaceae:
  • Supplejack, Ripogonum scandens, a vine native to New Zealand