The invention provides seed and plants of the watermelon line designated WNV142-1115. The invention thus relates to the plants, seeds and tissue cultures of watermelon line WNV142-1115, and to methods for producing a watermelon plant produced by crossing a plant of watermelon line WNV142-1115 with itself or with another watermelon plant, such as a plant of another line. The invention further relates to seeds and plants produced by such crossing. The invention further relates to parts of a plant of watermelon line WNV142-1115, including the fruit and gametes of such plants.