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- Parsons, John T., 1913-20071
- Paterson, J. V., 1867-19471
- Patton, William MacFarland1
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- Phycological Society of America1
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- Pletta, Dan H. (Dan Henry), 1903-19961
- Polhamus, Edward C. (Edward Charles), 1923-20012
- Randolph, James Robbins, 1891-19691
- Randolph, Lingan S., Sr., 1859-19221
- Roane, Curtis W. (Curtis Woodward), 1921-20181
- Rockwell International1
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