In this paper, we introduce a new widely linear iterative equalizer for Single Carrier systems with Frequency Domain Equalization (SC-FDE) that takes into account up to K independent interferers in the symbol estimation process. In the proposed equalizer design method, we assume that there is ideal feedback after the first equalizer iteration in order to reduce the complexity. It was seen that the proposed iterative structure has a better error performance when compared to the non-iterative version regardless of the number of interferers and the interference power.