343 (73) may refer to the following:
- 343 Guilty Spark - The Monitor of Installation 04.
- 343 Guilty Spark (level) - A level in Halo: Combat Evolved.
- 343 Guilty Spark (achievement) - An achievement in Halo: Combat Evolved Anniversary and Halo: The Master Chief Collection.
- 343 Industries - A Microsoft team developing the Halo Franchise.
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