Biological immortality is a state in which the rate of mortality from senescence is stable or decreasing, thus decoupling it from chronological age. Various unicellular and multicellular species, including some vertebrates, achieve this state either throughout their existence or after living long enough. A biologically immortal living being can still die from means other than senescence, such as through injury, poison, disease, predation, lack of available resources, or changes to environment.

The Immortal Life of Henrietta Lacks (2010) is a non-fiction book by American author Rebecca Skloot. It was the 2011 winner of the National Academies Communication Award for best creative work that helps the public understanding of topics in science, engineering or medicine.