疑核（拉丁语：Nucleus ambiguus）是延髓的一个神经核团。其位置在下橄榄核的前方。其中包含的神经元的种类多样。

自疑核发出迷走神经（第X号脑神经）的传出运动纤维。这些神经纤维支配咽部（Pharynx）和喉部（Larynx）的肌肉。舌咽神经（第IX号脑神经）的传出运动纤维也源自疑核。这些舌咽神经的纤维支配茎突咽肌（Stylopharyngeus）。

除肌肉运动功能以外，疑核还包含透射到心脏的副交感节前神经元。

The nucleus ambiguus (literally "ambiguous nucleus") is a group of large motor neurons, situated deep in the medullary reticular formation. The nucleus ambiguus contains the cell bodies of nerves that innervate the muscles of the soft palate, pharynx, and larynx which are strongly associated with speech and swallowing.