Efficiency may refer to:
- Efficiency, a measure of training methods
- Efficiency (emote), from Valentine's Day promotions
- Efficient, the Invention perk
- Scroll of efficiency, the Dungeoneering reward
- Scroll of dexterity, the Dungeoneering reward - instead of dexterity it reports as efficiency. When you save an item you get the message: Your efficient crafting ability means you retain some material.