Gatt Nikolai (b. 1941, Kharkiv) – paediatric neurologist and educator.

Nikolai Gatt was evacuated to Riga in 1953. Graduated from the Riga Medical Institute in 1968 and began his career as a child neuropsychiatrist in the Limbazi District. From 1970, he worked at the Republican Children's Hospital.

From 1980, he served as Chairman of the Scientific and Practical Society of Paediatric Neurologists and Psychiatrists of Latvia, and from 1981, as Chief Paediatric Neurologist of the Latvian Ministry of Health. In 1983, he initiated and led a course in paediatric neurology at the faculty for postgraduate medical training at the Riga Medical Institute.

As the ministry’s leading specialist, Nikolai Gatt successfully advocated for the expansion of the list of hazardous occupations prohibited for pregnant women and introduced active rehabilitative therapy. In the 1980s, he was the most frequently consulted expert in paediatric neurology, providing both formal and informal consultations across medical institutions.

In 1993, Gatt emigrated to the United States. He has lived and worked in Boston, where, until 1997, he was affiliated with the neurophysiology department at a children’s hospital. He later established a private medical company.