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The present research work investigates the effect of modified halloysite nanotubes (mHNTs) on the mechanical, thermal, and morphological properties of polyether ether ketone (PEEK) and polyetherimide (PEI). The developed PEEK/PEI blend matrix with 1 wt% of mHNTs shows a significant enhancement in mechanical properties like tensile, flexural, hardness, and impact. The developed blend matrix of PEEK/PEI matrix with mHNTs shows a significant enhancement of 25% in storage modulus (E′) and 13°C in glass transition temperature (Tg). In addition, an appreciable improvement of 26°C observed in maximum degradation temperature (Tmax). The effectiveness of the dispersion of mHNTs in the PEEK/PEI blend matrix was investigated by using SEM and TEM micrographs. The micrographs revealed that the mHNTs are uniformly dispersed in the PEEK/PEI matrix. The possible interaction of HNTs with PEEK/PEI and mHNTs with PEEK/PEI matrix were analyzed by Fourier Transform Infrared Spectroscopy (FTIR).