Stationary points of paths for H atom abstraction from CH3NHNH2 (monomethylhydrazine) by NO2 were characterized via CCSD(T)/6-311++G(3df,2p)//MPWB1K/6-31+G(d,p) and CCSD(T)/6-311+G(2df,p)// CCSD/6-31+G(d,p) calculations. Five transition states connecting CH3NHNH2-NO2 complexes to a manifold that includes CH3NHNH-HONO, CH3NNH2-HONO, CH3NNH2-HNO2, and CH3NHNH-HNO2 complexes were identified. Transition states that connect CH3NHNH-HONO, CH3NNH2-HONO, CH3NNH2-HNO2, and CH3NHNH-HNO2 complexes to each other via H atom exchange and/or hindered internal rotation were also identified. The high point in the minimum energy path from the CH3NHNH2 + NO2 reactant asymptote to the manifold of HONO-containing product states is a transition state 8.6 kcal/mol above the reactant asymptote. From a kinetics standpoint, this value is considerably higher than the 5.9 kcal/mol value that was estimated for it based on theoretical results for H atom abstraction from NH3 by NO2.