Ndu may refer to:

• Ndu, Cameroon, a town and commune in Cameroon
• Ndu, Democratic Republic of the Congo, a settlement in northern Congo
• Ndu languages, a language family of Papua New Guinea
• Ndo language, a language of Uganda and Congo

NDU may refer to:

• National Defense University, Republic of China (Taiwan)
• National Defence University, Islamabad, Pakistan
• National Defense University, United States
• National Distribution Union, a trade union in New Zealand
• Nationaldemokratisk Ungdom (National Democratic Youth), Swedish youth organisation
• Naval Diving Unit (Singapore), part of Singapore Navy
• Ndejje University, Uganda
• New Design University, Austria
• Niger Delta University, Nigeria
• The Nippon Dental University, Japan
• Notre Dame (disambiguation)#Universities and Colleges