Johannes is a Medieval Latin form of the personal name that usually appears as "John" in English language contexts. It is a variant of the Greek and Classical Latin variants (Ιωάννης, Ioannes), itself derived from the Hebrew name Yehochanan, meaning "Yahweh is gracious". The name became popular in Northern Europe, especially in Germany because of Christianity. Common German variants for Johannes are Johann, Hannes, Hans (diminutized to Hänschen or Hänsel, as known from "Hansel and Gretel", a fairy tale by the Grimm brothers), Jens (from Danish) and Jan (from Dutch, and found in many countries). In the Netherlands, Johannes was without interruption the most common masculine birth name until 1989.^[2] The English equivalent for Johannes is John.

• Joan, Jan, Gjon, Gjin and Gjovalin in Albanian
• Yoe or Yohe, uncommon American form^[3]
• Yaḥyā, in Arabic
• Chuan, in Aragonese
• Hovhannes, in Armenian
• Ioannis, in Greek
• Joanes, Joan, Jon, in Basque
• Joan, in Catalan and Occitan
• Hannes, Hans, Jaan, Jaanus, Joonas, Juhan, Juho and the familiar variants Juku and Juss in Estonian
• Yohannes, in Northern Ethiopian Semitic languages
• Jóannes, in Faroese
• Hannes, Jaani, Jani, Janne, Juho, Juha, Juhani, Juhana, Jukka, Jussi, Hannu, and Johannes in Finnish
• Jean, in French
• Xoán, in Galician
• Jóhannes and Hannes in Icelandic
• Yohanes, Johannes in Indonesian
• Eoghan or Eóin, in Irish or Scottish Gaelic
• Giovanni, in Italian
• Jānis, in Latvian
• Jonas, in Lithuanian
• Jan, in Polish
• João, in Portuguese
• Ioan, Iohannis, in Romanian
• Ivan (Иван), in Russian
• Juan, in Spanish
• Yahya, in Turkish
• Xun, in the Tzotzil language and Tzeltal language
• Ieuan or Ifan, with the diminutive Ianto, in Welsh, anglicized as "Evan"

• Johannes Climacus, pseudonym of Søren Kierkegaard in Philosophical Fragments and Concluding Unscientific Postscript
• Johannes de Silentio, pseudonym of Søren Kierkegaard in Fear and Trembling

• Johannes Cabal, the main character of a series of supernatural fiction novels and short stories by Jonathan L. Howard. Novels include: Johannes Cabal the Necromancer (2009), Johannes Cabal the Detective (2010), Johannes Cabal: The Fear Institute (2011). Short stories: "Johannes Cabal and the Blustery Day" (2004), "Exeunt Demon King" (2006), "The Ereshklig Working" (2010), and "The House of Gears" (2011).
• Johannes (The Traitor), the main antagonist in the video game Rogue Legacy
• Johannes "Jojo" Betzler, the title character of 2019 film Jojo Rabbit
• Johannes Krauser II, the alter ego of the main character in the anime/manga Detroit Metal City

• Klaus Iohannis, Romanian president of German origin

• Iohannes (consul 467), Roman consul in 467
• Joannes, Roman emperor in 423–425
• Schinderhannes, German outlaw
• Yuhana