Sylwester Porowski (born 1938), a Polish physicist specializing in solid-state and high pressure physics
Sylwester Szmyd (born 1978), a Polish professional road bicycle racer
See also
Robert Sylwester (born 1927), an Emeritus Professor of Education at the University of Oregon in the US
Sylwester Glacier, an Antarctic glacier flowing north between Jacobs Nunatak and MacAlpine Hills into Law Glacier, named after David L. Sylwester.
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