Stella Ifeanyi Smith is a Nigerian medical scientist with interests in molecular biology and biotechnology. Smith joined Nigeria Institute of Medical Research in 1988, and was made director of research in 2013. As of September 2018, she had 1739 citations on Google scholar

In 2001, she conducted a study on 459 diarrhoeal patients in Lagos. The patients were described as isolates from Shigella spp. and Escherichia coli. From her findings, she recommended that ampicillin, tetracycline, co-trimoxazole, and streptomycin should be avoided in the first stage treatment of shigellosis as the properties and resistance level of its effect from the study were of concern. She identified Nalidixic acid, ciprofloxacin and ofloxacin as safer alternatives.