The Belfast Health Trust said people with an urgent referral to see a neurologist can wait for 68 weeks for a consultation.
Waiting for a routine first outpatient appointment with a neurologist is 246 weeks.
The trust said that "waiting times are much longer than we would like."
According to NI, there is a shortage of neurology consultants for this "complex" service and "demand is outstripping capacity."
The most recent numbers follow a review of patient notes related to the work of neurology consultant Dr. Michael Watt.
The entity said it continued to collaborate with the Health and Welfare Board "to find a long-term solution to reduce waiting times in the near future."
"The Health Department has begun a review of the regional neurology services in September, which is ongoing," the institution added.
"Part of the review will examine the opportunities to address waiting times based on various initiatives to help improve the pathways for people with neurological conditions and those referenced with symptoms suggestive of a neurological condition."
Last month, the Health Department announced that more than 1,044 people will be called after a review of 2,500 patients with neurology.
It is the largest patient recall of the Belfast Health and Welfare Trust (HSC).