二氟化二氮（化学式：N2F2）是氮的氟化物之一，室温下为无色气体，存在顺式与反式两种异构体。
二氟化二氮可由叠氮化钠与氟气作用得到。叠氮化氟热分解，产生二氟化二氮和氮气：[3]
也可由二氟胺与氟化钾加合物的热分解得到：[3]
以上方法得到的是顺、反式二氟化二氮的混合物。用五氟化砷选择性地与顺式加合，经NaF-HF处理，可以获得比较纯的顺式-N2F2。通过N2F3+Sb2F11−与二茂铁反应，[4] 或用四氟肼与氯化铝在低温下作用，都只得到反式异构体。
无色气体。100°C分解。顺式与反式异构体形成平衡，25°C时顺式占90%。[3]
顺式中N=N距离为120.9pm，N-F为140.9pm；反式中N=N键长稍长，为122.4pm，N-F键则稍短，为139.8pm。顺式异构体中两个氟原子不在同一平面内，这可能是由于空间位阻和电子互斥所引起的。[5]
异构化的反应热为12.6kJ/mol。顺式在热力学上较稳定[來源請求]，但在动力学上活泼，可在两周内与玻璃完全反应，形成四氟化硅和一氧化二氮，而反式经过一个月仍无明显变化。N2F2可与路易斯酸反应生成含有N2F+的盐。
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