| Season Number: | 4 |
| Bgcolour: |
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| Num Episodes: | 3 |
| Network: | Adult Swim |
| Prev Season: | Season 3: Alternative |
| Next Season: | Season 5: Shoegaze |
| Episode List: | List of FLCL episodes |
The fourth season of the FLCL anime series, titled FLCL: Grunge, is produced by Production I.G and Adult Swim's production arm Williams Street. Grunge was animated by MontBlanc Pictures, with direction by Hitoshi Takekiyo and screenplay by Tetsuhiro Ikeda.[1] It aired from September 10 to September 24, 2023 in the United States on Adult Swim's Toonami programming block. In addition to contributing towards the soundtrack of the season, the Pillows performed the ending theme song "Vivid Venus".[2] Grunge is a prequel to the original FLCL series from 2000.