Natural Inflation with non-minimal coupling NMC to gravity (ξφ 2 ) is investigated in the context of an extended gravity of the form R + αR 2 . The treatment is performed in the Palatini formalism.We discuss various limitations of the model "α 1 and α 1" in light of two scenarios of inflation: a "Slow roll" and a "Constant roll".By analyzing the observational consequences of the model, our results show a significant improvement regarding compatibility between the theoretical results of this model and the experimental ones from Planck 2018, as exemplified by the tensor-to-scalar ratio and spectral index. Furthermore, a broader range of parameter space for natural inflation is now compatible with the confidence contours of Planck results. The notable effect of both NMC and αR 2 's contributions makes it a significant improvement. αR 2 gravity influences scalar-tensor ratio values. In contrast, NMC has a more significant impact on the spectral index values. Contributions to this area allow more excluded intervals to be included and are compatible with observational data.