Jeromus Johnson (November 2, 1775 in Wallabout, Kings County, New York – September 7, 1846 in Goshen, Orange County, New York) was an American merchant and politician from New York. From 1825 to 1829, he served two terms in the U.S. House of Representatives.
He was the son of Maj. Barent Johnson (1740–1782) and Anne (Remsen) Johnson. He attended the public schools, removed to New York City, and engaged in mercantile pursuits. In 1802, he married Mary Carpenter (1782–1863). He was a member of the New York State Assembly in 1822.
Johnson was elected as a Jacksonian to the 19th and 20th United States Congresses, holding office from March 4, 1825, to March 3, 1829. He was Chairman of the Committee on Public Expenditures (20th Congress).
On May 26, 1830, he was appointed an Appraiser of Merchandise for the Port of New York and served until 1840 when he retired from active business and removed to Goshen, the hometown of his wife.
He was buried at a private cemetery on his estate in Goshen.
Mayor of Brooklyn, Jeremiah Johnson (1766–1852), was his brother.