A Gold bar in Runescape is a bar of gold that can be made with the Smithing skill at level 40 by using a Gold ore with a Furnace, or by casting superheat Item on a gold ore. Smithing a Gold Bar will normally give a player 22.5 Smithing experience, but if the player wears Goldsmith gauntlets from the Family Crest quest, the experience gained is boosted to 56.25 per bar.

Gold bars cannot be made into armour of any type, but instead, can be crafted into various forms of jewellery with the Crafting skill. To craft a gold bar into jewellery, players must use the gold bar on a furnace with the correct mould in their inventory. If the player wants to craft jewel-encrusted gold, they must have the cut gem in their inventory, along with the correct mould.

Gold bars can also be bought from the G.E. Another way to obtain them is to loot eclectic implings, which can occasionally be looted for 5 noted gold bars.