Piotr Andreievich Chekov (Russian: Пётр Андреевич Чехов) was the imaginary brother that the manipulative Beta XII-A entity created in the mind of Pavel Chekov.

In 2268, the entity gave Pavel the "memories" of Piotr's untimely and brutal death at the hands of Klingons at a research outpost on Archanis IV in an effort to stir up anger and hatred in Chekov towards the survivors of a wrecked Klingon battle cruiser, so that it could feed off of the young Russian's emotions of hate and violence. Chekov believed he had seen Piotr's corpse and vowed on his grave to avenge his murder. (TOS: "Day of the Dove")

As Sulu noted that Pavel was an only child, it is unknown what, if any, basis in reality the entity used in its portrayal of the fictional Piotr.
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