John Henry Gillett (September 18, 1860 – March 16, 1920) was a justice of the Indiana Supreme Court from January 25, 1902, to January 4, 1909.

John H. Gillett was born in Medina, New York on September 18, 1860.

He was admitted to the bar in Porter County, Indiana in 1881, and taught law at Valparaiso College from 1882 to 1886.

[1] Gillett was an assistant attorney general of Indiana before being appointed as a circuit judge of Lake County in 1890, where he served until his appointment to the state supreme court in 1902.

[2] He hanged himself in his home with a clothesline, several months after the death of his wife.