Abstract: With the launch of energy efficiency initiatives and low-carbon life policy, single-phase bridgeless power factor correction (PFC) topologies attain popularity. Although many bridgeless topologies are proposed, the systematical bridgeless topology family derivation and performance overview have not been covered yet. This paper presents the bridgeless topology family derivation approach and classifications by organizing dual-converter cells in input-parallel output-parallel (IPOP) and input-parallel output-series (IPOS) configurations. To show the wide applicability of this proposed topology derivation method, 6 types of converter cells are exemplified to derive the corresponding 28 bridgeless topologies with detailed topology reviews. Moreover, the topology component count reductions are achieved further by following the symmetry and duality principles. Then, 12 key bridgeless topologies are selected and compared with conventional topologies for performance benchmarking. Lastly, based on the comparison results of 12 key bridgeless topologies, the characteristics and application scenarios of the IPOP and IPOS type bridgeless topologies are summarized.