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- Charles Theodore Pachelbel (1690–1750)
- John Knowles Paine (1839–1906)
- Thomas Palmersheim (born 1932)
- Carter Pann (born 1972)
- Horatio Parker (1863–1919)
- J. C. D. Parker (1828–1916)
- Harry Partch (1901–1974)
- Thomas Pasatieri (born 1945)
- Stephen Paulus (born 1947)
- Russell Peck (born 1945)
- Scott Perkins (born 1980)
- George Perle (1915–2009)
- William P. Perry (born 1930)
- Vincent Persichetti (1915–1987)
- Tobias Picker (born 1954)
- Daniel Pinkham (1923–2006)
- Walter Piston (1894–1976)
- Mika Pohjola (born 1971)
- Cole Porter (1891–1964)
- Quincy Porter (1897–1966)
- David L. Post (born 1949)
- Key Poulan (born 1962)
- Mel Powell (1923–1998)
- Silas G. Pratt (1846–1916)
- André Previn (born 1929)
- Florence Price (1887–1953)
- Frank Proto (born 1941)
- Kevin Puts (born 1972)
Read more about this topic: List Of American Composers