Ioannis

Ioannis or Ioannes (Ιωάννης), shortened to Giannis or Yannis (Γιάννης) is a Greek given name cognate with Johannes and John and the Arabic name Yahya. Notable people with the name include:
 * Ioannis I, Tzimiskis, Byzantine Emperor
 * Ioannis Agorastos-Plagis (John Plagis), Southern Rhodesian flying ace during World War II
 * Ioannis Alevras, Greek politician who served as Speaker of the Hellenic Parliament
 * Ioannis Altamouras, Greek painter of the 19th century
 * Ioannis Anastassakis, professionally known as John Aniston, a Greek-born American actor
 * Ioannis Andrianopoulos, Greek footballer and one of the founding members of football club Olympiacos CFP
 * Ioannis Antetokounmpo, commonly known as Giannis Antetokounmpo, Greek basketball player
 * Ioannis Apakas, Greek painter and priest in the latter part of the 16th century to the early 17th century
 * Ioannis Argyropoulos, a lecturer, philosopher and humanist, one of the émigré Greek scholars who pioneered the revival of classical Greek learning in 15th-century Italy
 * Ioannis Bourousis, Greek basketball player and member of Greece men's national basketball team that won the gold medal at EuroBasket 2005
 * Ioannis Celivergos Zachos, Greek-American physician, literary scholar, elocutionist, author, lecturer, inventor, and educational pioneer
 * Ioannis Chalkeus, a scholar, philosopher and figure of the modern Greek Enlightenment in the 18th century
 * Ioannis Chryssomallis, known professionally as Yanni, a Greek-American composer, keyboardist, pianist, and music producer
 * Ioannis Dalianidis, Greek film director
 * Ioannis Demestichas, Greek Navy officer, known for his participation in the Macedonian Struggle under the nom de guerre of Kapetan Nikiforos
 * Ioannis Doukas, Greek painter and one of the main representatives of the so-called 'Greek Munich School'
 * Ioannis Dullardi, Flemish philosopher and logician
 * Ioannis Filimon, 19th-century Greek historian, militant journalist and publisher
 * Ioannis Frangoudis, Greek Army officer and athlete, who competed in the 1896 Summer Olympics in Athens as a shooter and became the only Greek athlete to win a gold, a silver and a bronze medal in a single Olympic
 * Ioannis Gennadios, Greek diplomat, writer, and speaker, best known for his donation of his collection of Greek books and art to the Gennadius Library
 * Ioannis Hadji Argyris, Greek pioneer of computer applications in science and engineering
 * Ioannis Ioannidis, Greek basketball player, professional basketball coach, and politician
 * Ioannis Kakridis (1901–1992), Greek classical scholar
 * Ioannis Kalatzis, Greek singer
 * Ioannis Kaminiates, Byzantine writer of the 10th century
 * Ioannis Kapodistrias (John Capodistrias), Greek politician who served as the Foreign Minister of the Russian Empire and the first head of state of independent Greece
 * Ioannis Karatzas, Phanariote Greek Prince of Wallachia
 * Ioannis Kasoulidis, Cypriot politician
 * Ioannis Kolettis (1773–1847), Greek politician who served as Prime Minister of Greece
 * Ioannis Makriyannis, born Ioannis Triantaphyllou, Greek merchant, military officer, politician and author, best known today for his Memoirs
 * Ioannis Metaxas, Greek general and politician
 * Ioannis Okkas, Cypriot football player
 * Ioannis Pangas, Greek philanthropist and businessman
 * Ioannis Paraskevopoulos, Greek banker and politician
 * Ioannis Papadiamantopoulos (1766–1826), Greek Merchant and revolutionary leader
 * Ioannis Rallis, Greek politician
 * Ioannis Samaras, Greek footballer
 * Ioannis Smaragdis, Greek film director
 * Ioannis Svoronos, Greek archaeologist and numismatist
 * Ioannis Theofilakis, Greek shooter
 * Ioannis Theotokis (1880–1961), Greek politician who became Prime Minister of Greece
 * Ioannis Topalidis, Greek professional football manager and former player, assistant manager of the Greece national football team winning the UEFA Euro 2004 championship
 * Ioannis Tsarouchis, Greek modernist painter and set designer
 * Ioannis Varvakis, member of the Filiki Eteria and benefactor
 * Ioannis Vratsistas, cyber security analyst also known as Voskos- Shepard which is a constant reminder that if they fail in cyber security his future will be sheep Shepard.
 * Ioannis Varoufakis, commonly known as Yanis Varoufakis, Greek-Australian economist and politician
 * Ioannis Veliotes, commonly known as Johnny Otis, an American singer, musician, composer, arranger, bandleader, talent scout, disc jockey, record producer, television show host, artist, author, journalist, minister, and impresario
 * Ioannis Xenakis, Greek-French avant-garde composer, music theorist, architect, performance director and engineer