This paper presents a homogeneous set of stellar atmospheric parameters ($T_{\text{eff}}$, $\log g$, [Fe/H]) for the MILES spectral library, which covers the range $\lambda\lambda3525 – 7500$ Å at 2.3 Å spectral resolution. The library consists of 985 stars spanning a wide range in atmospheric parameters, from super metal-rich, cool stars to hot, metal-poor stars. The spectral resolution, spectral type coverage, and number of stars represent significant improvements over previous libraries used in population synthesis models. The atmospheric parameters are derived from a previous extensive compilation from the literature, with a focus on calibrating and bootstrapping data from other papers against a standard reference system. The reference system is based on the work of Soubiran, Katz, and Cayrel, which provides well-determined fundamental parameters for 211 echelle spectra of stars with $4000 \mathrm{~K}<T_{\text {eff }}<6300 \mathrm{~K}$ over a wide range of $\log g$ and [Fe/H]. The procedure involves selecting a high-quality, standard reference, compiling atmospheric parameters from bibliographic sources, calibrating and correcting systematic differences, and determining averaged, final atmospheric parameters for the library stars. The final set of atmospheric parameters for field stars is derived using different methods depending on the original literature sources, with a detailed explanation provided in the paper. The uncertainties in the derived parameters are consistent with those reported in a previous study, ensuring the reliability of the results. The paper also revises the atmospheric parameters of cluster stars, using updated metallicity scales and color-temperature relations to derive effective temperatures and surface gravities. The final set of atmospheric parameters for the 985 stars in MILES is presented, along with a summary of the methods used and the quality of the results.This paper presents a homogeneous set of stellar atmospheric parameters ($T_{\text{eff}}$, $\log g$, [Fe/H]) for the MILES spectral library, which covers the range $\lambda\lambda3525 – 7500$ Å at 2.3 Å spectral resolution. The library consists of 985 stars spanning a wide range in atmospheric parameters, from super metal-rich, cool stars to hot, metal-poor stars. The spectral resolution, spectral type coverage, and number of stars represent significant improvements over previous libraries used in population synthesis models. The atmospheric parameters are derived from a previous extensive compilation from the literature, with a focus on calibrating and bootstrapping data from other papers against a standard reference system. The reference system is based on the work of Soubiran, Katz, and Cayrel, which provides well-determined fundamental parameters for 211 echelle spectra of stars with $4000 \mathrm{~K}<T_{\text {eff }}<6300 \mathrm{~K}$ over a wide range of $\log g$ and [Fe/H]. The procedure involves selecting a high-quality, standard reference, compiling atmospheric parameters from bibliographic sources, calibrating and correcting systematic differences, and determining averaged, final atmospheric parameters for the library stars. The final set of atmospheric parameters for field stars is derived using different methods depending on the original literature sources, with a detailed explanation provided in the paper. The uncertainties in the derived parameters are consistent with those reported in a previous study, ensuring the reliability of the results. The paper also revises the atmospheric parameters of cluster stars, using updated metallicity scales and color-temperature relations to derive effective temperatures and surface gravities. The final set of atmospheric parameters for the 985 stars in MILES is presented, along with a summary of the methods used and the quality of the results.