Illusion may refer to:
- Illusion, a song by GuitarHeroPianoZero featuring Hatsune Miku.
- Illusion, a song by makoto featuring Megurine Luka.
- ILLusion, a song by RainingJellyfish featuring DEX.
- Illusion, a song by Zhuan Chang Langren featuring multiple VOCALOIDs.
- Illusion Catastrophe, a song by Putin-P featuring Hatsune Miku and Kagamine Len.
- Illusion Memories, as song by zzZ featuring SeeU.
- Illusion Rain, a song by Nobira-P featuring Nekomura Iroha.
- Illusionary Satisfaction, a song by ChouchouP featuring Hatsune Miku.