Commendations are awards found in Halo: Reach and Halo 4. Commendations are advanced through gameplay and provide bonuses such as credits, Experience Points and unlockables. Commendations are also intended to serve as an indication of how a given player tends to operate.
 Halo: Reach
- Main article: List of Halo: Reach Commendations
In Halo: Reach players advance commendations through campaign, multiplayer, and online Firefight gameplay. Players earn credits as they perform certain actions, many of which are Medals in and of themselves. Each commendation is represented by an icon plate. These commendations advance through five levels: Iron, Bronze, Silver, Gold, and Onyx before becoming Maxed Out. Upon advancing a commendation to a new level, players receive bonus credits. There are 16 campaign, 15 Firefight, and 14 multiplayer commendations.
- Iron rank (1 bar): rewards 100 - 500 cR (Average = 200 cR)
- Bronze rank (2 bars): rewards 200 - 1250 cR (Average = 700 cR)
- Silver rank (3 bars): rewards 400 - 2000 cR (Average = 1000 cR)
- Gold rank (4 bars): rewards 400 - 3000 cR (Average = 2400 cR)
- Onyx rank (black bars): rewards 400 - 3000 cR (Average = 2400 cR)
- Maxed out commendations look the same as Onyx, but with flames if viewed on Bungie.net and Halo Waypoint. There is no cR reward for maxing any commendation.
 Halo 4
- Main article: List of Halo 4 Commendations
Commendations return in Halo 4. Certain commendations in Halo 4 unlock armor permutations upon completion.
Halo 4 commendations are primarily advanced through playing War Games and Spartan Ops; only nine commendations can be completed in the campaign. Commendations are organized into five categories: Weapons, Enemies, Vehicles, Player, and Game Types. Weapons and Game Types commendations are earned only in War Games. Enemies commendations are only earned in Spartan Ops. Vehicles commendations can be advanced through Spartan Ops and War Games. Player commendations are all advanced in War Games save for the nine commendations completed by beating the campaign on Legendary.
There are seven tiers of commendations: Novice, Qualified, Proficient, Adept, Expert, Distinguished, and Master. Not all commendations utilize all seven tiers- the majority contain only five. If a commendation has only six tiers, it does not include Qualified. A five-tier commendation will also omit Distinguished.
Upon completing a tier, players are awarded bonus XP. The amount of XP varies from tier to tier and commendation to commendation, ranging from 250-10000XP.