Sidney E. Ellsworth (September 29, 1862 – October 31, 1935) was a justice of the North Dakota Supreme Court from 1909 to 1910.

He then moved to Jamestown, North Dakota continued his legal practice there for the next fifty years.

[1] In January 1909, Ellsworth was appointed to the North Dakota Supreme Court by Governor John Burke at the age of 46.

He served on the Supreme Court for a total of one year and eleven and a half months.

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