tWe demonstrate the possibility of fast and efficient solvent-free functionalization of buckypaper(BP) mats prefabricated from oxidized multiwalled carbon nanotubes (MWCNTs-ox), by using threerepresentative amines of different structure: one monofunctional aliphatic amine, octadecylamine(ODA), one monofunctional aromatic amine, 1-aminopyrene (AP), and one aromatic diamine, 1,5-diaminonaphthalene (DAN). The functionalization procedure, which relies on the formation of amidebonds with carboxylic groups of MWCNTs-ox, is performed at 150–180◦C under reduced pressure andtakes about 4 h including auxiliary degassing. The amine-treated BP samples (BP-ODA, BP-AP and BP-DAN, respectively) were characterized by means of a variety of analytical techniques such as Fourier-transforminfrared and Raman spectroscopy, thermogravimetric and differential thermal analysis, scanning andtransmission electron microscopy, scanning helium ion microscopy, and atomic force microscopy. Thehighest amine content was found for BP-ODA, and the lowest one was observed for BP-DAN, with a possi-ble contribution of non-covalently bonded amine molecules in all three cases. Despite of some differencesin spectral and morphological characteristics for amine-functionalized BP samples, they have in commona dramatically increased stability in water as compared to pristine BP and, on the other hand, a relativelyinvariable electrical conductivity.