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