Is ranked choice voting the same as instant runoff voting / single transferable vote / preference voting / the alternative vote?

Yes. There are a number of alternate terms for ranked choice voting.

Single-winner RCV is also known as:

  • Instant Runoff Voting (IRV)
  • Alternative voting
  • Preferential voting or preferential majority voting

Multi-winner RCV is also known as:

  • Proportional RCV
  • Single Transferable Vote (STV)
  • Hare system (e.g., England and Australia)
  • Multi-Winner RCV or At-Large RCV

There are other approaches to tallying ranked ballots, including but not limited to:

  • Borda count (point system)
  • Condorcet voting (methods comparing each candidate to every other candidate)
  • Sequential RCV (multi-winner elections with a series of IRV elections)