1-Fluornaphthalene is an organofluorine chemical compound from the group of naphthalene derivatives and fluoroaromatics.

[2] 1-Fluoronaphthalene is a colorless, combustible liquid, which is insoluble in water.

It has also been used in the synthesis of LY248686, a potent inhibitor of serotonin and norepinephrine uptake.

1-Fluoronaphthalene is also used as a component of the Organic Check Material mounted in canisters on Mars Science Laboratory Curiosity rover.

It's used for calibrating the Sample Analysis at Mars (SAM) instrument suite, being a synthetic organic compound not found in nature on Earth and not expected on Mars.