We present a guide to the implementation and uncertainty evaluation for spectral stray light corrections according to the widely used method as proposed by Zong et al. [Appl. Opt. 45, 1111 (2006)]. The uncertainty analysis is based on theMonteCarlo approach in accordance with theGuide to the Expression ofUncertainty inMeasurement (JCGM, Paris, 2008).We show that significant uncertainty contributions result from drifts of the spectrometer’s dark signal and the width of the in-band region selected for shaping stray light distribution functions. Additionally, a simplified method for estimating these uncertainty contributions is presented, which does not require a complex Monte Carlo analysis. We also show that stray light correction may introduce correlations with respect to wavelength.