This dataset gives the vapor pressure of 7-Methyl-1,5,7-triazabicyclo[4.4.0]dec-5-ene (CAS number: 84030-20-6) between 318 and 451 K. The data was measured using either the gas saturation method or distillation. The 7-Methyl-1,5,7-triazabicyclo[4.4.0]dec-5-ene had either a purity of 100.9 ± 1.4 wt% (distillation at University of Helsinki) or 98.3 ± 1.7 wt% (gas saturation experiments and distillation at Aalto University).