Riazuddin ({{lang-ar| رياض الدين}}) may refer to:

• Riazuddin (physicist) (1930–2013), Pakistani theoretical physicist
• Riazuddin (umpire) (born 1958), Pakistani cricket umpire
• Hamza Riazuddin (born 1989), English cricketer
• Riyaz Uddin (painter), Indian miniature painter
• Begum Akhtar Riazuddin (born 1928)
• Shaikh Riazuddin (born 1971), Indian cricketer

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