Dinitrogen oxide can potentially refer to any of at least four compounds:
- Dinitrogen monoxide (nitrous oxide), N<sub>2</sub>O
- Dinitrogen dioxide, N<sub>2</sub>O<sub>2</sub>, an unstable dimer of nitric oxide
- Dinitrogen trioxide, N<sub>2</sub>O<sub>3</sub>
- Dinitrogen tetroxide, N<sub>2</sub>O<sub>4</sub>
- Dinitrogen pentoxide, N<sub>2</sub>O<sub>5</sub>