Udaya Kumar or Udayakumar may refer to:
- Udaya Kumar (academic), professor at Jawaharlal Nehru University
- Udaya Kumar (designer), designer of the Indian rupee sign
- Udaya Kumar (director), Indian film director and editor
- K. Udayakumar, Indian volleyball player
- R. V. Udayakumar, Tamil actor and director
- S. P. Udayakumar, Indian anti-nuclear activist
- Udaykumar (1933–1985), Indian film actor and producer in Kannada cinema