The Honda Z series or Monkey Bike was a line of minibikes made by Honda which have a model number starting with the letter Z. The bike came to be known as a monkey bike because those riding them "looked like monkeys".

A minibike is a two-wheeled, motorized, off-highway recreational vehicle popularized in the 1960s and 1970s, but available continuously from a wide variety of manufacturers since 1959. Their off-highway nature and typically entirely off-road legal status differentiate minibikes from motorcycles and mopeds, and their miniature size differentiates them from dirt bikes.