No, watermelon is not a vegetable; it is a fruit.
Watermelon, like tomatoes, pumpkins, and peppers, is botanically classified as a fruit. It grows on a vine native to southern Africa. Although often considered a type of melon, watermelon is not in the Cucumis genus, which includes other melons like cantaloupe and honeydew. It is characterized by its smooth rind and sweet, juicy flesh.