Greta
- Blwyddyn: 2020
- Gwlad: Germany, Sweden, United States of America
- Genre: Documentary, History
- Stiwdio: B-Reel Films, Svenska Filminstitutet, BBC Storyville, Filmbasen Film, WDR, SWR, SVT
- Allweddair: autism, climate change, environmentalism, asperger's syndrome, speculative, environmental activist, desperate, suspicious, climate change activism, environmental documentary, youth icon, climate emergency, climate crisis, incredulous, arrogant, demeaning, dubious, inflammatory, melodramatic, pessimistic, skeptical
- Cyfarwyddwr: Nathan Grossman
- Cast: Greta Thunberg, Svante Thunberg, Niclas Svenningsen, Arnold Schwarzenegger, António Guterres, Kyra Gantois