Joannis

Joannis is a given name. Notable people with the name include:


 * Joannis Andreou, Greek swimmer
 * Joannis Antonius de Sancto Giorgio, Italian jurist
 * Joannis Avramidis, Greek-Austrian sculptor
 * Joannis Capodistrias, Greek politician in Russia
 * Joannis de Segovia, Spanish theologian
 * Joannis Eschuid, English astrologer
 * Joannis Melissanidis, Greek artistic gymnast
 * Joannis Metaxas, Greek politician
 * Joannis Phrangoudis, Greek Army officer
 * Joannis Romberch de Kyrspe, Westphalia
 * Joannis Vislicensis, medieval author
 * Joanni Perronet, French fencer
 * Andreas Eudaemon-Joannis, Greek Jesuit and philosopher
 * Giovanni Giorgi (composer) (Joannis de Georgiis), Italian composer and priest
 * Giovanni Maria Alemanni, Italian composer and lutenist
 * Jan Weenix, Dutch painter
 * Jan z Lublina, Polish composer and organist
 * Jens Nilssøn (Joannis Nicolai), Bishop of Oslo
 * Johann Hedwig, German botanist
 * John Martyn (botanist), English botanist

as a surname
 * Joseph de Joannis (1864–1932), French clergyman and amateur entomologist