Used in medicine for the treatment of iodine deficiency, thyroid disorders including radioiodine therapy for thyroid cancer, and as an expectorant in cough medications.

Commonly employed in nuclear imaging and radiation detection due to its ability to scintillate when exposed to gamma rays, especially when doped with thallium.

Utilized in organic chemistry as a source of iodide ions in substitution reactions, such as the Finkelstein reaction.

Also applied in animal feed as a nutritional supplement to ensure adequate iodine intake.