Bone marrow donation is a life-saving medical procedure that helps patients battling severe blood cancers, immune deficiencies, and life-threatening genetic disorders. Each year, thousands of individuals rely on bone marrow or stem cell transplants, and donor registries play a crucial role in making these matches possible. One of the most common questions asked is: Can males donate bone marrow?The answer is a definite yes—and more importantly, male donors are the most requested donors worldwide. From match reliability to immune system compatibility, men play an essential role in successful bone marrow transplants. This comprehensive guide explains why men are so valuable as donors, how eligibility works, and what males should know before joining a donor registry.