半闭后不圆唇元音（英語：close-mid back unrounded vowel、high-mid back unrounded vowel[1]）是相应的半闭后圆唇元音/o/的扁唇音。发音同/o/但是口型不圆。
- 其元音舌位是後，表示舌頭的位置會盡可能地朝向口腔後部，但不至于阻礙氣流而被歸類為子音。
- 其圓唇度為不圓唇元音，嘴唇自然放鬆，不特別向前突起。
雖然國際語音學學會較偏好在描述元音高度時使用「開」和「閉」，但許多語言學家也會用「高」和「低」來描述舌頭相對於口腔上部的距離。
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