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Minecraft Java 1.21 Mods

Browse 170 free mods for Minecraft Java 1.21 — popular picks include The Lost Castle [NeoForge/Fabric], Medieval Buildings [End Edition], Medieval Buildings - New Structures!.

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170 mods

1.21.1neoforge

The Lost Castle [NeoForge/Fabric]

A gigantic castle that once was the home of a long forgotten civilization

21Mdownloads

1.21.5neoforge

Medieval Buildings [End Edition]

New incredible medieval-style structures for the End!

18Mdownloads

1.20.2neoforge

Medieval Buildings - New Structures!

Add exciting medieval buildings with hidden enemies and treasures to the world!

17Mdownloads

1.21.1neoforge

Castle in the Sky

This mod adds new structure: Castle in the Sky in your world

8.6Mdownloads

1.21.9neoforge

Medieval Buildings [Nether Edition]

New incredible medieval-style structures for the Nether!

7.9Mdownloads

1.21.1fabric

DungeonZ

Base mod to add new dungeons with one default dungeon

1.8Mdownloads

1.21.9neoforge

Dungeons and Taverns Woodland Mansion Overhaul

This Mod Overhauls the Woodland Mansion with 184 different rooms and 8 type of rooms. adding a basement layer and a road leading away from the woodland mansion

1.5Mdownloads

1.21.1neoforge

CastleBlocks

Alternative to chunk claiming, build castles instead!

555kdownloads

1.21.5forge

[Retired] Dungeons and Taverns End Castle Standalone

Retired, we decided to retire this project since keeping it up becomes too much of a technical challange for something that is already within main DNT. There be dragons

489kdownloads

1.20.1fabric

Loot Integrations: Medieval Buildings & End & Nether

Adds better loot to Medieval Buildings & End structures chests, including modded loot

381kdownloads

1.19.2forge

Rev's Better Structures

A mod that adds immersive, randomly generated vanilla-style structures like ruins, trees, and castles to enhance exploration in 1.16+.

289kdownloads

1.21.8fabric

Grim Kingdoms: Lost structures & ruins

Adds Castles - Unique vanilla mobs/ hidden items

249kdownloads

1.21fabric

Grim kingdoms: Vanilla Edition

Adds Castles : Both mod versions are vanilla, this version simply removes unique vanilla special items

176kdownloads

1.21forge

Epic Dungeons: A Roguelike Minecraft

Awesome uniquely varied epic dungeons, from the buried Crystal Castle to the spider-infested Forgotten Sewers. Your traveller's journey begins!

163kdownloads

1.21fabric

Loot Integrations: The Lost Castle

Adds better loot to The Lost Castle chests including modded loot

147kdownloads

1.21.8

Novik Pack

Texture Tweaks for the building community of Minecraft

113kdownloads

1.21.8neoforge

Castle Tower

Adds a new Castle Tower to Forest Biomes

36kdownloads

1.21neoforge

Middle Age: castles

This mod adds new Castles in Middle Age style.

32kdownloads

1.21fabric

Our Story - Earth

A large exploration and survival modpack with custom quests, world generation, dungeons, bosses, building, farming, and multiplayer adventure.

25kdownloads

1.21

Japanese Castle - Structure ✅

Japanese Castle is a fortified stronghold in a Minecraft vanilla-friendly style, inspired by traditional Japanese architecture, featuring tiered towers, curved rooftops, and defensive walls.

22kdownloads

1.21.9neoforge

Castle Shift

Castle Shift introduces procedurally generated castles with diverse layouts, modular room variations, and dynamic architectural themes — creating a different structure each time.

17kdownloads

1.21

Pillager Medieval Mansion Dungeon

Medieval mansion that turns Pillager into trap-filled complexes with tactical combat and exclusive loot.

14kdownloads

1.21.8

Sword Pack In 3D

Upgrade your Minecraft weapons with 3D Swords! Stunning models add depth, realism, and unique style. Perfect for PvP, building, or adventure

13kdownloads

1.21.1neoforge

Epic Knights of the Seven Kingdoms

An addon for Epic Knights which adds various armors, sigils, weapons from Game of Thrones, House of the Dragon and Knight of the Seven Kingdoms and A Song of Ice and Fire Universe by George R. R. Martin in general

12kdownloads

1.21.3fabric

NMI - server side mods only

This is a collection of over ✨150+✨ server side mods that enhance your gameplay with voice chat, factions, economy, seasons, dungeons, buildings, mobs and much more. 🌌

11kdownloads

1.20.1forge

Lost eternity

Lost eternity is a world generation mod that adds unique surface buildings and dangerous underground dungeons with traps, enemies, and great loot.

9.2kdownloads

1.21.1forge

Ember's Castles And Keeps

Adds big new castles and towers with traps, enemies, loot and even parkour challenges!

7.8kdownloads

1.21.5

Belzebuth Nether Kingdom

Adds a news structure to the Nether, The Belzebuth Castle, along with a new Boss, New Tools, New Items, New Enemies and New Music Discs!

6.8kdownloads

1.17.1

Korevix's Tools

Overhauls Minecrafts base tools while still keeping that vanilla flair

6.2kdownloads

1.20spigot

Castle Siege | King, teams, kits, abilities, multi-arena, maps & more

Seize or shield in Castle Siege

5.6kdownloads

1.21.11fabric

Vanilla+ Expansion

This mod adds a few features using vanilla blocks, items, and mobs including structures like an illusioner castle, a variant oak, and new recipes.

5.3kdownloads

1.21.1neoforge

MineColonies-Caos e Ordem [Unnoficial]

A MineColonies modpack inspired by the Brazilian Minecraft series MineColonies: Chaos and Order, focused on medieval and magical progression, colony building, and survival.

3.3kdownloads