343 (73) may refer to the following:
- 343 Guilty Spark - The Monitor of Installation 04.
- 343 Guilty Spark (achievement) - An achievement in Halo: Combat Evolved Anniversary and Halo: The Master Chief Collection.
- 343 Guilty Spark (level) - The level in Halo: Combat Evolved.
- 343 Industries - A Microsoft Game Studios internal-build team established to create new properties for the Halo series.
- 343 Industries (manufacturer) - A manufacturer of MJOLNIR [GEN2] armors.
- 343 Sparkast - Official podcast of 343 Industries.
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