Whatsit

Whatsit may refer to:
 * Whatsit, a placeholder name
 * Waterman Whatsit, an aeroplane designed by Waldo Waterman
 * Mrs. Whatsit, a character in A Wrinkle in Time by Madeleine L'Engle
 * Wotsits, cheese puffs produced by Walkers, a British snack food manufacturer
 * The WHATSIT database program
 * Martin M-1 Whatsit, glider