In this letter, the possible appearance of N = 2 supersymmetry at a low energy scale is investigated in the context of unified theories. Introducing mirror particles for all the gauge and matter multiplets of the minimal supersymmetric extension of the Standard Model (MSSM), the measured values of sin 2 θ W and α 3 (M Z ) indicate that the N = 2 threshold scale M S 2 cannot be lower than ∼ 10 1 4 GeV. If the U(1) normalization coefficient k is treated as a free parameter,M S 2 can be as low as 10 9 GeV. On the other hand, if mirror quarks and leptons are absent and a non-standard value for k is used, N = 2 supersymmetry breaking could in principle occur at the electroweak scale.