Southdown

Southdown may refer to:


 * Southdown (sheep), a breed of sheep
 * Southdown, Cornwall, England
 * Southdown, a suburb of Harpenden, Hertfordshire, England
 * Southdown, New Zealand, a suburb of Auckland
 * Southdown Motor Services, a former bus company based in Sussex, England
 * Southdown Power Station, a power station in Auckland
 * Southdown, a cement company acquired by Cemex