This work is concerned with investigating the glass transition behavior of ionic liquids as a function of nanoconfinement. The glass transition temperature was found to increase with a decrease in confinement length, below a critical confinement of 40-50 nm and 80-90 nm for 1-butyl-3-methylimidazolium tetrafluoro-borate and 1-methyl-3-octylimidazolium tetrafluoro-borate between alumina surfaces, respectively.