Heinrich Alexander Pagenstecher (18 March 1825, Elberfeld – 4 January 1889, Hamburg) was a German zoologist. He studied medicine at the universities of Göttingen, Heidelberg and Berlin and furthered his education in Paris. Following graduation, he worked as a general practitioner in his hometown of Elberfeld (1847), as a spa doctor in Salzbrunn (1848–49) and as a physician in Barmen (1849). In 1856 he obtained his habilitation for obstetrics at the University of Heidelberg. The herpetological species Pseudemoia pagenstecheri (southern grass tussock skink) is named in his honor.