Ioannis or Ioannes (Greek: Ιωάννης), shortened to Giannis or Yannis (Γιάννης) is a Greek given name, cognate with Johannes and John. Notable people with the name include:
Ioannis Chasapis, Greek bastardela
Ioannis Alevras, Greek politician
Ioannis Amanatidis, Greek footballer
Ioannis Antetokounmpo, commonly known as Giannis Antetokounmpo, Greek basketball player
Ioannis Giannaros, Greek payments person
Ioannis Bourousis, Greek basketball player
Ioannis Drymonakos, Greek swimmer
Ioannis Gagaloudis, Greek basketball player
Ioannis Kakridis (1901–1992), Greek classical scholar
Ioannis Kalitzakis, Greek footballer
Ioannis Kapodistrias (John Capodistrias), Greek politician in Russia
Ioannis Kasoulidis, Cypriot politician
Ioannis Kolettis (1773–1847), Greek politician who served as Prime Minister of Greece
Ioannis Limnios-Sekeris, Greek historian and humanitarianist
Ioannis Metaxas, Greek general and politician
Ioannis Okkas, Cypriot football player
Ioannis Paraskevopoulos, Greek banker and politician
Ioannis Plagis (John Plagis), Southern Rhodesian flying ace during World War II
Ioannis Rallis, Greek politician
Ioannis Samaras, Greek footballer
Ioannis Tamouridis, Greek cyclist
Ioannis Theofilakis, Greek shooter
Ioannis Theotokis (1880–1961), Greek politician who became Prime Minister of Greece
Ioannis Varoufakis - commonly known as Yanis Varoufakis, Greek politician
Ioannis Raptakis, Father of Teddy2smile
