Szczepan Aleksander Pieniążek (1913–2008) was a Polish pomologist, professor of the Warsaw University of Life Sciences, and a vice-president of the Polish Academy of Sciences. He was a pioneer in Polish horticulture, which was in need of reform after World War II. Having studied in the United States, Pieniążek brought to Poland innovative solutions to various fruit-growing problems. In his scientific research, he generally focused on pomology, plant physiology, and conservation of orchards. He published over one hundred publications, including an academic handbook "Horticulture".