Spool may refer to:

• Spool, a usually low-flanged or unflanged cylinder on which thread, wire, cable, paper, film, straps, or tape is wound for distribution or use.
  • Bobbin, a cylinder or reel on which a quantity of thread, yarn or wire is wound for use in a particular machine or device
  • Cable reel used to carry various types of electrical wires
• Spool (software company), a software company that allows users to save video and text onto their mobile devices to view the content offline
• Spooling, Simultaneous Peripheral Operations On-line, transferring data between media concurrently with other work, in computing
• Spool, the unit of rotating components inside a jet engine; see Turbofan#Turbofan configurations
• Spool pin, a type of pin used in pin tumbler locks to prevent picking
• Spooling up, increasing RPMs and thrust in a jet engine after the throttle has been advanced
• Spool (record label), active 1998–2008