The performance of supercritical water oxidation(SCWO) was investigated for the destruction of pyridine, aniline, nitrobenzene. Three aromatic compounds including benzene, toluene, and phenol were also tested under similar conditions for the comparison of destruction performance of SCWO. Pyridine was the most difficult to destroy, nitrobenzene being the easiest among the three compounds with nitrogen. The destruction rates of the three aromatic compounds with nitrogen were slower than the other three without nitrogen. All the major organic by-products from the three nitrogen containing compounds were identified as having the aromatic ring structures. Virtually all(80-100%) of nitrogen from the destruction of pyridine was converted to ammonia. Less portion(50-70%)of nitrogen was converted to ammonia in SCWO of aniline. The ammonia yield was less than 10% of nitrogen from the destruction of nitrobenzene. Neither nitrite ion nor nitrate ion were formed in appreciable quantities. Significant portion of nitrogen from the SCWO of aniline and nitrobezene is expected to be converted to nitrogen gas(N₂). It appears that reaction temperatures substantially higher than 500℃ and/or catalysts are required for the faster and complete destruction of these nitrogen containing aromatic compounds by SCWO.