Harder

Harder may refer to:
 * Harder (surname)
 * Harder Fjord, North Greenland
 * Harder (mountain), mountain near Interlaken in Switzerland, with a viewpoint at the Harderkulm
 * Harder, Washington, unincorporated community, United States
 * Harder (fish), or South African mullet
 * USS Harder
 * Harder Stadium, University of California, Santa Barbara
 * "Harder", a 2002 song by Kosheen
 * "Harder", a 2022 song by Chris Brown from Breezy
 * "Harder" (Tiësto and Kshmr song), 2016
 * "Harder" (Jax Jones and Bebe Rexha song), 2019