A circuit board includes a circuit substrate, a first solder mask, and a plurality of heat dissipation fins. The circuit substrate includes a first surface. The first solder mask is arranged on the first surface. The plurality of heat dissipation fins are arranged on a surface of the first solder mask facing away from the first surface. A heat dissipation channel is formed between any two adjacent of the plurality of heat dissipation fins. A camera assembly having the circuit board and an electronic device having the circuit board are also provided.