Peter Day may refer to:
- Peter Day (chemist) (1938–2020), British inorganic chemist
- Peter Day (broadcaster) (1947–2023), British broadcaster on BBC Radio
- Pete Day (born 1970), recording engineer, record producer and songwriter
- Peter Morton Day (1914–1984), journalist and ecumenical leader in the Episcopal Church in the United States
This disambiguation page lists articles about people with the same name.
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