An atomizing head for an electronic cigarette, the atomizing head being universal and replaceable, includes a support base defining an atomizing chamber, a heating device, and a liquid guiding member. The liquid guiding member includes a liquid guiding wick, a liquid guiding nozzle, and a liquid guiding nozzle seat. One end of the liquid guiding wick extends from the liquid guiding nozzle seat to the heating device. The nozzle and nozzle seat cooperatively define a receiving cavity, the receiving cavity is blocked by the liquid guiding wick, and an inner surface of the receiving cavity defines at least one liquid guiding slot for providing a channel for a liquid to the heating device. An atomizer and an electronic cigarette including the replaceable universal atomizing head are also described.
