At the end of every Halo 3 Multiplayer match, one player is designated the Most Valuable Player, abbreviated as MVP. At the post-match screen, the MVP is shown on the right hand side, along with an image of the player's armour permutation, color scheme and emblem.

MVP is earned by:

• Team Slayer: Being the player with most kills.
• VIP: Being the player who has killed the VIP the most.
• Team Oddball: Being the player who has held on to the Oddball the longest.
• CTF: Being the player to score the flag the most.
• Assault: Being the player to detonate the bomb the most.
• Territories: Being the player who has the highest number of Territory captures.
• Team King: Being the player who has spent the most time in the hill.
• Team SWAT: Being the player who has the most kills.

The Halo 3 Achievement MVP, worth 5 Gamerpoints, is earned by being the MVP in a ranked playlist.