A photon defense system was a technology used aboard starships and other installations as part of weapons systems.

In the 2280s decade, Pavel Chekov would recall early work designing Federation photon defense involving his Russian ancestors. In the year 2286, Commander Chekov addressed a group of Starfleet weapons officer trainees aboard the USS Enterprise-A and told them of early Russian contributions to photon defense systems. Ensign William Bearclaw, speaking out of turn, accused Chekov of lying about this, and the two nearly fought over the issue in the ship's main engineering section until they were interrupted by a yellow alert. (TOS comic: "What Goes Around...")

Chekov's brief comment did not reveal the purpose or arrangement of photon defense, but it likely either involves technology that harnesses the qualities of photon particles or has something to do with photon torpedo systems.

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