Post-COVID-19 olfactory assessment and rehabilitation are approaches used to assess and treat loss of smell (anosmia) or reduced sense of smell (hyposmia) that may occur following COVID-19 infection. These procedures involve olfactory assessment tests to determine the degree of impairment, followed by rehabilitation programmes that may include olfactory training and specific therapies to help restore or improve impaired olfactory function. The aim is to gradually restore the perception of smells and improve the quality of life of people affected by this post-COVID-19 condition.