soda machine or soda maker is a home appliance for carbonating tap water by using carbon dioxide from a pressurized cartridge. The machine is often delivered with flavorings which can be added afterwards to the carbonated water to make soda, like for instance orange, lemon or cola flavours.

Soda machines can either be connected to a separate water tap in the house, or be a freestanding unit. Some refrigerators are delivered with a built-in soda machine.