Nilgün Belgün was born on March 18, 1953 in Istanbul. She is a theater and cinema actress

She graduated from Private Şişli High School and Istanbul Municipal Conservatory's Singing and Theater Department. Here she took phonetic diction lessons from Melih Cevdet Anday. In 1973, she started her career in art. He first gained experience in Devekuşu Kabare Theater, and later worked in ensembles such as Ali Poyrazoğlu Theater, Levent Kırca Theater, Dormen Theater and Theater Istanbul. In 1990, she was recognized by a larger audience in a short time with her role as "GÜLPEMBE" in the Darbukator Bayram in "Another Night". She played various characters in various parodies in television entertainment shows such as "İŞTE MÜZİK İSTE EĞLENCE" and "GECE SEFASI".

In addition to her artistic life, Belgün wrote two books and participated in social activities. She worked in the "Women's Awareness" campaign of the Menopause and Osteoporosis Association of Turkey and took part in health studies on Parkinson's disease for two years. Nilgün Belgün married for the first time at the age of 19 to theater actor and comedian Abdullah Şahin.

She has a daughter named Oylum Şahin from her marriage. Nilgün Belgün has a daughter named Merve Gencer from her second husband İlhan Gencer. Nilgün Belgün made her third marriage with Atilla Demircioğlu. Due to Esra Erol's giving birth, she was the temporary host of the Esra Erol'da program.