Phase 4

Phase 4, Phase IV or Phase Four may refer to:

Media

 * Marvel Cinematic Universe: Phase Four, a group of superhero films and television series from 2021–2022
 * Phase IV (1974 film), a science-fiction horror film directed Saul Bass
 * Phase IV (2002 film), a Canadian action-thriller film directed by Bryan Goeres
 * Phase IV (album), a 1982 album by Art Zoyd
 * Phase-4, a character in Dead or Alive 5 Ultimate

Other

 * Phase IV clinical trial, the fourth of the phases of clinical research
 * Phase 4 Films, a Canadian film distribution company
 * Phase 4 Stereo, record label and recording process
 * Four-Phase Systems, a computer company
 * Four-phase logic, is a type of, and design methodology for dynamic logic