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
See also
Johannis (disambiguation) Iohannis Ioannis Alternate forms for the name John