Nam Byeong-gil (, 1820–1869), also known as Nam Sang-gil (南相吉, 남상길), courtesy name Jasang (), art name Yugiljae () or Hyecheon (), was a Korean mathematician and astronomer of the Joseon period. He was a member of the Uiryeong Nam clan. His brother Nam Byeong-cheol (南秉哲) was also a noted astronomer.
His works included: Siheon giyo () Seonggyeong () Yangdo uidoseol () Chubo cheoprye () Chiljeong bobeop () Taeyang chulippyo () Seonhak jeongui () Seontaek giyo () Jungseong sinpyo () Chunchu ilsiggo ()
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