Reyaz Uddin Ahmad (Bengali: রেয়াজুদ্দীন আহমদ, Arabic: رياض الدين أحمد) is a Bengali masculine given name of Arabic origin. It may refer to:
- Reazuddin Ahmad Mashadi (1859–1918), Bengali writer and philosopher
- Muhammad Reazuddin Ahmad (1861–1933), Bengali writer and journalist
- Sheikh Reyazuddin Ahmed (1882–1972), Bengali author
- Md. Reazuddin Ahmed (1929–1997), former deputy speaker of Bangladesh parliament
- Riaz Uddin Ahmed (1945–2021), Bangladeshi journalist and former president of Jatiya Press Club