Ioannis Demestichas (Greek: Ιωάννης Δεμέστιχας, 1882–1960) was a Greek Navy officer. He is best known for his participation in the Macedonian Struggle under the nom de guerre of Kapetan Nikiforos (Καπετάν Νικηφόρος). He held various senior commands in the Greek Navy, including thrice as Chief of the Hellenic Navy General Staff, and also served briefly in cabinet positions.