A promising framework combines Green's Function (GF) theory and the Bethe-Salpeter Equation (BSE) formalism. This approach produces notably strong results in the realm of solid-state physics, that align well with experimental data. In contrast, its applications in molecular quantum chemistry is limited, despite its potential as a promising alternative to commonly used DFT. Although it has been successfully applied to systems such as small organic molecules, aromatic molecules, and single transition metal complexes, its potential for first-row transition metal complexes has yet to be scrutinized systematically. This work aims to fill this gap by exploring the potential of BSE@GW theory for predicting and assigning electronic excitation spectra for a range of first-row transition metal complexes featuring different compositions in terms of metal-centered (MC) and charge transfer (CT) transitions.