Siân Ellen Halcrow is a New Zealand academic in the field of biological anthropology, specialising in infant and child health and disease in the past.

[2] Halcrow completed a PhD at the University of Otago in 2006; her thesis was titled Subadult health and disease in late prehistoric mainland Southeast Asia.

[2] She has led and worked on archaeological projects in Thailand, Laos, Cambodia, Indonesia, China, Chile and New Zealand.

[4] In 2018, Halcrow won the Hill Tinsley Medal from the New Zealand Association of Scientists.

In the same year, she received the University of Otago's Rowheath Trust Award and Carl Smith Medal for outstanding scholarly achievement of researchers in the early stages of their careers.