Abstract: A beam angle adjustable LED lamp has a simicircular and tubular heat-dissipating body, a light source module mounted on the heat-dissipating body to constitute a thermal contact therewith, a contact module pivotally mounted on one end of the heat-dissipating body, and a power converter mounted inside the heat-dissipating body and respectively and electrically connected with the light source module and the contact module. With the foregoing structure, a lighting direction of the light source module is perpendicular to an electrical connection path of the contact module and a lamp socket. As the contact module is pivotable relative to the heat-dissipating body, a beam angle of the light source on the heat-dissipating body can be adequately adjusted based on a lighting requirement.