The use of choice voting (also referred to as the "single transferable vote" and the "Hare system")  is popular among organizations and corporations.  Here are some examples of groups that use choice voting and how they use it.

American Philosophical Association (President, Vice President, Executive Committee, Secretary-Treasurer, Board of Officers, Nominating Committee)  
Committee Director seats are filled via annual at-large elections by the Committee Members using choice voting.

Californians for Electoral Reform (Director) Directors are elected annually using choice voting.

CUNY Faculty Senate (Senators) Junior and Senior Senators are elected using choice voting.

Eclipse (Add-in Provider Members, Committer Members) Each Add-In Member or Committer Member, as applicable, is entitled to cast numbered preference votes for as many candidates as there are open seats on the Board allocated to Add-In Provider Members and Committer Members, as applicable.

ERotaryLondon (President, a President-elect, a Secretary and a Treasurer) The Secretary circulates ballot papers at the beginning of every year which will be counted choice voting.

Green Idea A provision within the by-laws of this organization allows the use of choice voting and Condorcet methods upon a two-thirds majority vote.

Green Party of the United States (SC co-chairs) Co-chairs are elected using choice voting by means of the “Droop” method.  This requires that the total number of votes are divided by the number of seats plus one.  A candidate must pass this threshold to be elected.  A number of other ancillary Green Party organizations incorporate choice voting.

KPFA (Staff and Listener-Sponsor Delegates, Listener-Sponsor Directors, Affiliate Representative Directors) Any position that provides more than one seat is elected using choice voting.

League of Professional System Administrators (Director) Elections for Director are conducted using the "Meek" form of  choice voting.  The Meek method requires computer counting for a complicated formula that can be effective in ensuring that the elected candidates total votes are as equal as possible to the quotas.

McMaster University Faculty of Business(President, Provost, Dean of the Faculty (Chair), Associate Dean, Dean of Graduate Studies or delegate, Director of Undergraduate Programs , Director of MBA Program, Director of Ph.D. Program)
The Faculty Council (President, Provost, Vice-President (Research and International Affairs), Dean of the Faculty (Chair), Associate Dean of the Faculty, Dean of Graduate Studies or delegate, Director of the Engineering and Management Program, Chair of the Department of Economics or delegate, Chair of the Department of Mathematics & Statistics or delegate)

All elections except for the full-time, non-teaching staff members of the Faculty employ choice voting.

Minnesota State Bar Association (officers, delegates, representatives to other bodies and commissions and representatives from the Assembly to the Council) The Droop method of creating a threshold for choice voting elections is used.

National Youth Rights Association (Board of Directors) Candidates for the board of directors will be selected by choice voting using the ERS97 method published by the Electoral Reform Society.

New Mexico State University (Faculty Committees) Choice voting is used to elect all committee members.

Open Grid Forum (Director) Elections use choice voting, with a recommendation for using a “suitable” algorithm such as pSTV.

Open Health Tools (Committer Stewards, Project Lead Stewards) The Committers and Project Leads of Open Health Tools hold annual at-large elections for their respective stewards using choice voting.
 
Oxford University Contract Bridge Association (Chairman, Secretary, Treasurer, Captain, Tournament Director, Cuppers Secretary, Publicity and Development Officer, and Webmaster.)  Voting is meant to be secret and with the use of choice voting.

Pacifica Radio (Delegates) Voters are given the option of voting for one candidate or ranking the candidates in order of preference, with the intention of achieving proportional representation.

Penn State University Faculty Senate Elections of senators are conducted using choice voting.

University of Texas at Austin Faculty Council (General Faculty Representatives) Elections of faculty representatives are conducted using choice voting.

See a list of Organizations using instant runoff voting

See a list of British Organizations using Choice Voting (STV)