Leonard Francis "Mike" O'Brien (January 20, 1904 – March 30, 1939) was an American field hockey player who competed in the 1932 Summer Olympics and 1936 Summer Olympics.
| Olympic medal record | ||
|---|---|---|
| Men's field hockey | ||
 |
1932 Los Angeles | Team competition |
He was born in North Adams, Massachusetts and died in Boston, Massachusetts.
In 1932 he was a member of the American field hockey team, which won the bronze medal. He played one match as back.
Four years later he was a member of the American field hockey team, which lost all three matches in the preliminary round and did not advance. He played three matches as back.
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