John Solomon Fullmer (July 21, 1807 – October 8, 1883) was an American politician and farmer, born in Huntington, Pennsylvania.

Fullmer spent his childhood and early adult years on his family's farm in Huntington, Pennsylvania.

[2] While living in Nauvoo, Fullmer left to serve as a missionary to Pennsylvania in 1842 and Vermilion County, Illinois, in 1845.

Fullmer said "It was evident that the magistrate intended to outreach the pile of the brethren, so as to imprison those on trial for want of bail; but it happened that there was strength to cover the demand.

"He laid his right arm out for me to lay my head upon it..... After the brethren were all quiet and seemed asleep, excepting myself, he talked with me a little about the prospects of his deliverance.

[2] The next morning, Joseph sent Fullmer to Nauvoo to assist in obtaining witnesses for a treason hearing scheduled for June 29.

When he returned to the jail later that day, he was refused admission by the guards and, as a result, missed the mob's attack on the jailhouse.

After his return, Fullmer married his third wife, Sarah Ann Stevenson, on October 12, 1856, in Salt Lake City, Utah.