查士丁尼二世（被剜鼻者）（希腊语：Ιουστινιανός Β' ο Ρινότμητος，实际读音为优士丁尼安；约670年－711年12月11日），685年至695年与及705年至711年两度在位为拜占庭帝国皇帝。

在查士丁尼二世统治期间，帝国的意大利部分的很多城市企图独立。查士丁尼二世仰赖各行省权贵的支持进行镇压。687年－689年，查士丁尼二世远征色雷斯和马其顿。他使当地的斯拉夫部落臣服于帝国，并将一部分斯拉夫人迁至小亚细亚居住。因此，在斯拉夫民族的发展及接受基督教等方面，查士丁尼二世起到很大推动作用。692年，查士丁尼二世在与阿拉伯征服者的战役中溃败，导致帝国失去了亚美尼亚南部。

Justinian II (Greek:Ἰουστινιανός Β΄, Ioustinianos II, Latin:Iustinianus Augustus) (669 – 11 December 711), surnamed the Rhinotmetos or Rhinotmetus (ὁ Ῥινότμητος, "the slit-nosed"), was the last Byzantine Emperor of the Heraclian Dynasty, reigning from 685 to 695 and again from 705 to 711. Justinian II was an ambitious and passionate ruler who was keen to restore the Empire to its former glories, but he responded poorly to any opposition to his will and lacked the finesse of his father, Constantine IV. Consequently, he generated enormous opposition to his reign, resulting in his deposition in 695 in a popular uprising, and he only returned to the throne in 705 with the help of a Bulgar and Slav army. His second reign was even more despotic than the first, and it too saw his eventual overthrow in 711, abandoned by his army who turned on him before killing him.