What are the main differences between FIVB, USAV, NFHS, and NCAA volleyball rules?

Full Explanation

The four major volleyball rulesets share most fundamental rules but differ in these key areas: (1) Substitutions: FIVB allows 6 per set, USAV allows 15, NCAA allows 15 in Division I and 18 in Divisions II and III, and NFHS allows 18. (2) Libero serving: USAV, NCAA and NFHS allow the libero to serve in one rotational position per set; FIVB prohibits libero serving. USAV and NCAA allow up to two liberos per set, and NFHS also allows two from 2026-27, with only one on court at a time. (3) Timeout length: 30 seconds under FIVB and USAV, up to 60 seconds under NFHS, and 75 seconds by default under NCAA (60 or 90 by agreement). None of the four rulesets caps set scores. (4) Technical and media timeouts: the 2025-2028 FIVB rules have no technical timeouts, and time-outs and substitutions are the only regular game interruptions. In domestic play they are optional: NCAA conferences may use a media timeout or a technical timeout at 15 points in sets 1 to 4, USAV leaves media timeouts to the event organizer, and NFHS lets state associations set media timeouts for broadcast matches. (5) Roster size: FIVB allows up to 12 players, or up to 14 in FIVB, World and Official senior competitions, where a team with more than 12 players must list two Liberos; USAV allows up to 15 players; NFHS and NCAA set no limit. (6) Video review: FIVB uses a challenge system at elite events under its challenge regulation, and NCAA schools or conferences may use the Challenge Review System; USAV and NFHS do not use video review.

Rulesets covered: FIVB/USAV/NFHS/NCAA  |  Rule Reference: FIVB Rules 4.1.1, 6.2, 15.1, 19.3.1.3; USAV Indoor Rules Book; NFHS Rules; NCAA Women's Volleyball Rules