Jan Bystrek (17 June 1934 – 20 February 2020) was a Polish botanist and professor of natural sciences. He was employed at the Department of Systematic and Geography of Plants at the Maria Curie-Skłodowska University from 1956 until 2004. He published research in many fields, including botany, floristry, lichenology, systematics, environmental protection, biogeography, ecology, bioindication, and nature and landscape protection. He was involved in popularizing knowledge about nature and ecological education.
