Iohannis is both a surname and a given name. Notable people with the name include:
Given name Iohannis de Lignano, Italian jurist Iohannis de Serravalle, Italian Franciscan and humanist Iohannis Eckii, Latinized name of Johann Maier von Eck
Surname
Carmen Iohannis, first lady of Romania Klaus Iohannis, the fifth president of Romania
See also Johannis (disambiguation) Ioannis Joannis Alternate forms for the name John