Baron Den Kenjirō (田 健治郎, 25 March 1855 – 16 November 1930) was a Japanese politician and cabinet minister in the pre-war government of the Empire of Japan.

Den was also a co-founder of Kaishinsha Motorcar Works, a predecessor to present-day Nissan and the original manufacturer of Datsun automobiles.

Around 1890, he came to the attention of Communications Minister Gotō Shōjirō, who recruited him into the central bureaucracy of the Meiji government.

He rose to the position of vice minister, and concurrently served on the board of governors of the Japanese Government Railways.

He returned to government service in 1900 as Director of the Administration Bureau of the Communications Ministry, but resigned again only a year later to run for election to the Lower House of the Diet of Japan under the sponsorship of Itō Hirobumi and the Rikken Seiyūkai political party.

During this period, he expressed concerns over the dominance of the United States and Great Britain over the new League of Nations, which contributed to an "encirclement" of Japan.