GregTech is a series of mods for Minecraft that expand upon, and increase the effective difficulty of, IndustrialCraft 2, and if installed, BuildCraft and/or Forestry.

GregTech mods change a large number of recipes, both standard, and from other mods, on top of additional items and mechanics being supplied by GregTech. Because GregTech is capable of referencing items from multiple mods for the purposes of balance, GregTech item recipes will include all relevant mod items that can be used to craft a particular item.