No—not as a regular, canonical boss in the Calamity Mod release reflected by the current boss roster. The endgame list includes Exo Mechs and Supreme Witch, Calamitas, but not Yharim. There is a special-seed exception: THE LORDE, a joke boss based on Yharim, appears in Get fixed boi worlds. It is not the canonical Yharim encounter.
Is Yharim a boss in Calamity Mod?
Yharim is a major figure in Calamity’s lore, but the Official Calamity Mod Wiki’s boss progression does not list him as a fight. Its endgame encounters are Exo Mechs and Supreme Witch, Calamitas; Calamitas’s page describes her as a final boss alongside the Exo Mechs. See the boss progression and Supreme Witch, Calamitas page.
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The lore gives Yharim titles including Godseeker, Golden Heretic, and Tyrant King, and presents him as a prominent figure behind many events. That narrative importance can make a boss fight seem like an obvious progression goal, but it does not mean the fight is available in-game. The wiki’s lore page also notes that its lore material is a work in progress and may change: Calamity lore.
What is THE LORDE?
THE LORDE is a hidden, post-Moon Lord joke boss available only in Get fixed boi worlds. It is based on Yharim, but it is a parody rather than a canonical Yharim boss encounter. Details are on the wiki’s THE LORDE page.
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So if you mean “Can I fight a boss inspired by Yharim?”, yes, under that special-seed condition. If you mean “Can I fight Yharim as a regular boss in standard Calamity progression?”, the roster says no.
Don’t confuse Yharim with Yharon
Yharon, Dragon of Rebirth, is a separate Calamity boss and Yharim’s ally. Yharon’s place in the boss progression does not mean Yharim himself is fought. The wiki’s Yharim disambiguation page distinguishes the characters and describes Yharim’s lore role.
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Has a Yharim fight been announced for a future release?
The cited boss roster and public project information do not establish a release date—or confirm that a canonical Yharim fight will be added. The public Calamity repository describes itself as a mirror of the latest official release and says active development takes place in a separate private repository, so its public contents do not reveal the full development plans: CalamityModPublic on GitHub.
That is not proof that a fight will never exist; it means there is no confirmed date to rely on. Treat predictions as speculation unless the developers make a clear announcement.
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How to check your installed version
Calamity content can change between releases, so check the boss roster for the version you are actually playing if you need a current answer. Calamity’s official site directs players to tModLoader for installation: Calamity Mod official website. When checking, distinguish standard progression from a Get fixed boi world; the latter is where the Yharim-based joke boss appears.
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