Throwback uniforms, throwback jerseys, retro kits or heritage guernseys are sports uniforms styled to resemble the uniforms that a team wore in the past. One-time or limited-time retro uniforms are sometimes produced to be worn by teams in games, on special occasions such as anniversaries of significant events.

Retro style is imitative or consciously derivative of lifestyles, trends, or art forms from history, including in music, modes, fashions, or attitudes. In popular culture, the "nostalgia cycle" is typically for the two decades that begin 20–30 years ago.