Forge Mods for Minecraft 1.20
Browse 550 free Forge mods for Minecraft 1.20 — popular picks include Beyond Bosses 2, The Day Of The Beast, Mineria.
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Beyond Bosses 2
This enderdragon overhaul will amaze you
The Day Of The Beast
Introduces The Devil, a new boss fight in the game.
Mineria
New ores, old machinery, druidic magic, medicinal plants, deadly poisons and final boss
Beyond Bosses
Beyond Bosses enhances the ender dragon boss introducing a new look to the end, a new ender dragon model, new boss attacks, and new boss music
The Ore Dimensions
Adds many new ore dimensions with bosses!
Hyperlink
Add 5 items for the endgame, a workbench to craft them, and 1boss.
Arcalis Bosses
Expand your world with new exciting and chellenging boss battles.
MAJNR Skyblock (Official)
An adventurous Skyblock modpack with new mobs, bosses, and extra dimensions including the Aether.
egorsans's bosses (abandoned)
this mod adding new bosses with dropping!
Nature and Creatures
The mod will add many new mobs to the game, which will have unique mechanics, abilities and drops. In almost every biome you will find at least a unique mob, and you can also stumble upon new bosses.
Cataclysm Apotheosis Addon
More powerful legendary big boss!
Bloxy's Bosses
Adds 10 More Bosses To Minecraft!
Austinsupercar's Dungeons and Bosses
Difficult dungeons and bosses with anti-cheat mechanics.
The Leviathan
This mod adds a Leviathan boss inspired by JasonG5's concept from 2012
CrazyVillagers
CrazyVillagers adds hilarious and chaotic new villagers to Minecraft! From a pooping villager to a newborn baby, a fat villager, and the powerful Mecha Boss — expect weird behaviors, dark humor, and total village madness!
XBB's Roaring Knight
This mod adds an epic boss named Roaring Knight from Deltarune.
Sensei Illager
Adds dojos and a Sensei Illager mini boss to cherry grove biomes.
Witheria
Adds a boss with many attack patterns and unique animations. Beatable in Vanilla.
Mortality - A Terramity Addon
Mortality adds new content and weapons, minibosses and resource farming methods, but most importantly, Structures and Dungeons to Conquer!
food bosses: reheated!
the joke-ish foods are back
God of War Ragnarok
GOW Themed mod that adds many weapons, bosses, and more!
Abyssal Corrupter
Face the terrifying Abyssal Corrupter — a multi-stage deep abyss boss that can be summoned via ritual altar in Minecraft 1.21.1 NeoForge.
Shurui's DMZ Raid-Bosses
Turn any mob into a fully configurable, scheduled raid boss event - no coding, no datapacks, all in-game. Set up multiple named bosses, each with its own WorldEdit-defined arena, sign-up window, and reward table. Health and damage scale with playercount.
Cataclysm Apotheosis Addon NEO
Give the boss in L_ender's Cataclysm a big buff!
Red Forest
Boss fights, quests, tasks, tools, and guns. Biomes and dimensions with 13+ mobs and 15+ structures and many more.
LUNACY: The World of RPG
Are you board of regular Minecraft bosses, mobs, and weapons? Fear not, Lunacy has it all! Enjoy many new bosses, mobs, weapons, and armor in this amazing mod!
[SMS]Spirit Mediumship Spell - Iron's Spells Addon
This mod adds fresh spells to Iron's Spells 'n Spellbooks that let you summon all kinds of wizards, tough vanilla and Iron's Spells 'n Spellbooks foes, and even boss mobs from mods like Cataclysm.
Wise Mystical Tree of Wisdom
Adds a new boss, The Wise Mystical Tree of Wisdom!

BossCraft Respawn : Unofficial Port
Unofficial Port of BossCraft 1.3.2
Nether Sentinel
Meet the Nether Sentinel: Minecraft's new Nether boss! Face this fiery challenge and prove your bravery in an epic battle.
Gateway of Doom
Throw a Devil Eye to open a configurable combat gateway. Survive random or fixed waves, bosses and timed challenges for rewards—or suffer debuffs. Includes auto gateways, custom mobs, profiles, admin menus, commands, diagnostics, plus a stable add-on API.
Paladin's Oath
This Mod Adds Mobs Bosses Armor Weapons And Abilities To your Minecraft World Can You Be the Best Paladin?
Shuumatsu no Valkyrie: Project Ragnarok
This mod is based off the manga and anime Shuumatsu no Valkyrie: Record of Ragnarok. It has skills, weapons, enchantments, transformations, races, abilities, dimensions. biomes, structures, bosses, mobs, stats, and most importantly, BUDDA
Leo's Bosses
A mod that added bosses with nice loots to Minecraft,
Extra Bosses
Adds a few extra bosses into the game, plus a few extra features. (IN DEVELOPMENT)
Zoologics
Modification adding in game new animals, and plants, bosses.