Johann Friedrich Ahlfeld (16 October 1843 in Alsleben – 25 May 1929 in Marburg) was a German obstetrician and gynecologist.

From 1863 to 1867 he studied medicine at the universities of Greifswald and Leipzig, where he was a pupil of Carl Siegmund Franz Credé.

In 1868 he received his doctorate with the dissertation-thesis Über Zerreissung der Schamfuge während der Geburt.

[1] In 1873 he obtained his habilitation for obstetrics and gynecology at the University of Leipzig, and in 1877 attained the title of associate professor.

In 1881 he became a full professor at the University of Giessen, then two years later relocated to Marburg as director of the university Frauenklinik and school for midwives.