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Tsutomu Yukawa (湯川勉) (1911-1942) was a Japanese aikidoka.

Born in Gobo in Wakayama prefecture, Yukawa began his martial arts training in judo, studying under Tesshin Hoshi. In 1931 he travelled to Tokyo to study at the Kodokan, but whilst in the city he encountered aikido's founder, Morihei Ueshiba, and was soundly defeated. He then took up the study of aikido.{{cite journal|url=http://www.aikido-jurnal.ro/index.php?pagina=bio_17|journal=Aikido Jurnal|title=Biography of Tsutomu Yukawa|language=Romanian}} While a student at the Kobukan, Yukawa was known for his physical strength, earning the nickname the "Kobukan Samson".{{cite book|last=Ueshiba|first=Morihei|coauthors=Stevens, John|url=https://books.google.com/books?id=i2yShshAQJEC&pg=PA14|title=The Art of Peace|publisher=Shambhala Publications|year=2002|isbn=978-1-57062-964-8|page=14}} He was strong enough to clap two sacks of rice together.{{cite book|last=Ueshiba|first=Kisshomaru|title=Aikido|publisher=Hozansha Pub. Co.|year=1974|isbn=978-0-87040-268-5|page=159}} Yukawa was one of only a handful of students to study with Ueshiba for more than five years.{{cite journal|url=http://aikido-france.net/articles/pranin/|title=Is O-Sensei really the father of modern Aikido?|last=Pranin|first=Stanley|date=Fall 1996|issue=109|journal=Aikido Journal}} A favourite student of Ueshiba, he also married the founder's niece in 1934.

He died from stab wounds sustained during a fight with a soldier in Osaka.