It's Such a Beautiful Day
- Blwyddyn: 2012
- Gwlad: United States of America
- Genre: Animation, Comedy
- Stiwdio: Bitter Films
- Allweddair: nightmare, immortality, narration, dark comedy, surrealism, hospital, illness, mental illness, adult animation, death of parent, divorced parents, stick figures, philosophical, existential horror, brooding, existential crisis
- Cyfarwyddwr: Don Hertzfeldt
- Cast: Don Hertzfeldt, Sara Cushman