Pigeonhole may refer to: Pigeonholes, nesting spaces formed in a dovecote (also spelt dovecot or doocot) Pigeonhole, one of the boxes in a pigeon coop Pigeonhole principle, a mathematical principle Pigeonhole sort, a sorting algorithm Pigeonhole messagebox, a communication method Pigeonhole People, a Northern Territory indigenous (Australian Aboriginal) people… (More on Pigeonhole)