Mods for Minecraft Java
Browse 1,184 free mods for Minecraft Java — popular picks include Fishbowl, Ocean Floating Lifebelts, Extrabiomes.
Step by step: How to install Minecraft Java mods & modpacks
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Fishbowl
Adds a fishbowl curios equipable that allows merfolk and other ocean-dwelling origins to breathe on land.
Ocean Floating Lifebelts
Adds 9 new floating lifebelts to ocean biomes
Extrabiomes
ExtraBiomes is a world generation addon/mod for Minecraft, available for both Bedrock and Java Edition, that adds 26 new biomes to the overworld, along with the mobs, blocks, and structures to fill them, from burnt forests and jellyfish-filled oceans to
CinderStride – Lava Walker
A rare Bastion relic grants Lava Walker boots, letting you walk across lava and turn the Nether’s oceans into your highway.
No Air Mining Penalty
removes the default mining speed penalty when the player is underwater or not standing on solid ground

Faentum's Deep Sea Expansion
Deep Oceans are no more safe, Dare to Face the Abyss!
ROTP-Jumpin-Jack-Flash
Added the Stand "Jumpin' Jack Flash" from Stone Ocean.Features: barrage, heavy punch, scatter bullet, and gravity manipulation ability.
FandomCraft Infinite
Now you can play your favorite games in Minecraft! This mod adds features from many games and media such as Kingdom of Hearts, Legend of Zelda, Star Ocean, Final Fantasy, Fringe, and many more
Leviathan
A new oceanic mob for Minecraft 1.20+
oceans biomes
Create worlds made entirely of oceans with a simple configuration screen. Choose the ocean biome, tweak depth, and enable or disable islands and ocean structures.

Water World - Atolls
Water World - Atolls is an immersive Minecraft mod (Fabric) that breathes life into ocean biomes by introducing procedurally generated Atoll structures, complete with custom villager AI behaviors, dynamic fishing, and unique blocks to ease water buildin
Dolphin Boots
this lightweight mod adds boots that make you fast underwater
Wearable Lanterns (Unofficial Port)
Wearable Lanterns is a vanilla-friendly mod that lets you equip lanterns for hands-free lighting while adventuring, mining, and exploring dark caves. It also includes waterproof encased lanterns for underwater exploration.
Aquatic Plugin
This is a Minecraft Plugin wich adds many Ocean and Fish releated things to Minecraft

Hybrid Aquatic + Starcatcher Compatibility
Adds Compatibility Between Starcatcher v3 and Hybrid Aquatic
Sea eater: ocean horror
something unknown fell into the ocean
Pride Blåhaj Backport
Backports the Blahåj Replushed mod's newer pride sharks to 1.20.1.
Colorful Sea Lanterns
Adds craft-able sea lanterns of all dye colors.
Sea Things
This mod make prismarite very good. Sea Things show you the power of Oceans, Guardians and etc.
Ore Minus
Customize Minecraft ore spawn rates by biome. Easily set multipliers for vanilla and modded ores (e.g., 2x diamonds in deserts, zero coal in ocean). Essential modpack ore distribution tool.
Single Island Generator
A Minecraft world generation mod that adds an Island world type, generating an ocean-only world with one randomly generated survival island.
Tek N Astra (Sea of Dreams)
This mod aims to add way more content to the game, especially post-Ender Dragon part of the game!
Lost Island
Lost Island is a Minecraft mod that places you on a tiny island in an endless ocean. Survive with scarce resources while floating barrels bring supplies to your shore. Early release — bugs may occur.
Improved Rails (TURNABLE POWERED RAILS)
Underwater-version Rails! Rails that's always activated!
overworld underground Lava remover, and underground water remover separate files
Simply removes underground lava and water only in the overworld, be aware the water remover will make pockets of air to deep rivers and wont work on ocean biomes and its underground

Oceanic sword remastered
Adds a mythical pirate blade to your world allowing you to harness the power of the seas.
Sea of Steves
Boat battle plugin for Minecraft servers
Simple Submarines
Adds submarines for underwater exploration.
Monster Origins
(WIP) Minecraft 1.20.1 (and now 1.21.1) / Fabric addon for Origins that adds four origins Arachne (a humanoid spider), Medusa (a gorgon), Harpy (a storm-wind bird-woman), and Mermaid (a singer of the deep) each built around a different playstyle
Aquaticworld
This mod adds 5 new creatures to diversify the oceans.The mod will also add 9 new structures and their prehistory.The mod is based on the game "Subnautica"
Vulcade
Post-processing shader packs that run on Minecraft's Vulkan renderer. Bloom, sun glare, volumetric light shafts, ore glow, plus dedicated underwater, Nether and End looks — with Low/Medium/High/Ultra profiles.

Realistic Oceans
Adds realistic & deep oceans to minecraft
OceanAntiCheat - 1.13
Anticheat for 1.13
Sea Core Balance & Utilities
A balance and utility addon for Mine Mine no Mi and CartAddon, focused on cleaner PvP, reworked abilities, improved fruit terrain effects, bosses, crates, and server-friendly config tools.
Fish Rework - Fishing
A plugin that reworks the fishing mechanic, by fishing up unique sea creatures instead of normal fish. Custom drops, items, armor, weapons, skill progression, recipes, custom GUI, advancements, artifacts and more.
UnderWater Pressure
This mod adds water pressure mechanic