The present application relates to an atomizer and an electronic cigarette, comprising an atomizer housing and an atomization module. The atomizer housing is provided with a liquid storage chamber, an atomization chamber, and a condensation chamber. The liquid storage chamber communicates with the atomization chamber. The atomization module is disposed between the liquid storage chamber and the atomization chamber, and is configured to heat and atomize vaporizable liquid from the liquid storage chamber into the atomization chamber. A blocking protrusion is fixedly disposed in the atomization chamber, configured to prevent liquid from flowing out of the atomization chamber. The present application achieves consistent inhalation effects, better fidelity in vaporizing the liquid, and an improved user experience.