Kill cows, horses, donkeys, mules, llamas, or hoglins to get leather
Fish for leather as treasure
Trade with leatherworker villagers for leather
Find leather in chests in structures like villages, dungeons, bastions, and strongholds
Use a looting enchantment on a weapon to increase leather drops from mobs
In Bedrock Edition, use a cauldron and leather armor to dye leather armor, not to make leather itself
In Java Edition, use a crafting table to combine 4 rabbit hide into 1 leather
In Bedrock Edition, use a crafting table to combine 4 rabbit hide into 1 leather