We report a comprehensive ab initio investigation of the conformers of dehydrogenated glycine radicals using the STO‐3G, 3‐21G, and aug‐cc‐pVDZ (aVDZ) basis sets and the UHF and UMP2 (H2N‐CH‐COOH and HN‐CH2‐COOH) as well as MCSCF and MRCI (H2N‐CH2‐COO) methods via two different conformational search strategies generating initial structures for optimizations by (a) removing H atoms from glycine conformers and (b) scanning torsional angles describing internal rotation along the CC, CN, and CO (except for H2N‐CH2‐COO) bonds of the radicals. We find four H2N‐CH‐COOH {InCH, IInCH, IIInCH, IVnCH} and seven HN‐CH2‐COOH {IpNH, IIpNH, IIInNH, IVpNH VnNH, VIpNH, VIIpNH} conformers with classical(adiabatic) relative energies of {0.00(0.00), 1.57(1.55), 5.25(5.03), 9.85(9.72)} and {0.00(0.00), 0.78(1.06), 1.93(2.08), 3.34(3.16), 3.39(3.29), 5.00(4.86), 9.27(8.87)} kcal/mol, respectively, obtained with UCCSD(T)‐F12b/aug‐cc‐pVTZ(+UCCSD(T)‐F12b/aVDZ ZPE correction) and four H2N‐CH2‐COO {IpCOO, IInCOO, IIIpCOO, IVnCOO} conformers with MRCI‐F12+Q/aVDZ(+MRCI/aVDZ ZPE correction) energies of {0.00(0.00), 1.65(1.64), 1.78(1.75), 2.21(2.21)} kcal/mol, where n and p denote C1 and Cs symmetry. The MRCI‐F12+Q[UCCSD(T)‐F12b] InCH → IpNH and InCH → IpCOO classical(adiabatic) isomerization energies are 18.51(17.32)[21.20(20.01)] and 31.88(31.66) kcal/mol, respectively.