John M. Cochrane (March 11, 1859 – July 20, 1904) was an American judge who served as a justice of the Supreme Court of North Dakota from 1903 to 1904.

He practiced law there until the fall of 1894, when he was elected Probate Judge of Grand Forks County to a two-year term.

He was reelected to this position in 1886, and resigned in 1887 in order to be accept his appointment as state's attorney of Grand Forks County.

He served for only one year and seven months before dying in office on July 20, 1904, at the age of 45.

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