The splanchnic nerves are paired visceral nerves (nerves that contribute to the innervation of the internal organs), carrying fibers of the autonomic nervous system (visceral efferent fibers) as well as sensory fibers from the organs (visceral afferent fibers). All carry sympathetic fibers except for the pelvic splanchnic nerves, which carry parasympathetic fibers.

The term splanchnic nerves can refer to:

• Cardiopulmonary nerves^[1]
• Thoracic splanchnic nerves (greater, lesser, and least)
• Lumbar splanchnic nerves
• Sacral splanchnic nerves
• Pelvic splanchnic nerves