Mudder

Mudder may refer to:


 * A participant in:
 * Mud bogging, a form of off-road motorsport
 * Multi-user dungeon, an online game
 * Obstacle course racing, a sport in which competitors on foot must overcome obstacles including mud
 * Tough Mudder, an endurance event series
 * A racehorse that performs well on muddy or wet tracks
 * A character in "Jaynestown", an episode of the science fiction television series Firefly
 * Mother (pronunciation spelling)
 * Marian Mudder, Dutch actor and author