A heat dissipating device includes multiple self-aligning, interconnecting fins linked together. Each self-aligning, interconnecting fin has a first side edge, a second side edge, an inside surface, an outside surface, multiple alignment arms, and multiple outer connecting tabs. The alignment arms perpendicularly extend respectively from the first side edge and the second side edge and have distal ends and multiple inclined edges. The inclined edges press respectively against inclined edges of corresponding alignment arms on an adjacent fin. Then the outer connecting tabs are bent inward against the inside surface of the adjacent fin to hold the fins together securely.