Reinier Jan Cornelis Blom (31 March 1867 in Amsterdam – 12 August 1943 in Amsterdam) was a Dutch gymnast who competed in the 1908 Summer Olympics.
In the individual all-around competition he finished 61st.
During 50 years he was member of KTV Olympia, a gymnastics club in Amsterdam.
He was founding member of the Royal Dutch Christian Gymnastics Association.
This biographical article related to Dutch artistic gymnastics is a stub.