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Denis Joseph Cogan (c. 1858 – 18 January 1944) was an Irish businessman, politician and Member of Parliament (MP) in the Parliament of the United Kingdom of Great Britain and Ireland from 1900 to 1907.
In 1886, he married Elizabeth Murphy, of Larage Bridge, Wicklow.
Cogan became a member of Dublin Chamber of Commerce in 1907 and was elected its president in 1932. He remained a member of the Council of the Chamber until his death.
A director of Hibernian Fire and General Insurance from its foundation in 1908, Cogan was chairman of the board for two decades until his death.
He was also well known in horseracing circles as an owner and breeder.
- "Death of ex-MP". Irish Press. 20 January 1944.