Ys IV can refer to:
- Ys IV: The Dawn of Ys - a video game in the Ys series developed for the PC Engine by Hudson Soft
- Ys IV: Mask of the Sun - a video game in the Ys series developed for the Super Famicom by Tonkin House, and later remade for the PlayStation 2
- Ys: Foliage Ocean in Celceta - a video game in the Ys series developed for the PlayStation Vita by Nihon Falcom