Amos DeForest Lockwood (1811–1884) was an American manufacturer and engineer based in Providence, Rhode Island.

He was self-trained as a mechanical engineer, and gradually expanded his scope to all areas of textile mill construction.

He was a cofounder, in 1882, of Lockwood, Greene & Company, which would become one of the largest engineering firms in the United States in the twentieth century.

[2] At the age of sixteen, the younger Lockwood moved to Rehoboth to work in the store of the Orleans Manufacturing Company, owned by David Wilkinson and Benjamin Peck.

Lockwood's first project in Lewiston was the organization and construction of the Androscoggin Mill, begun in 1860.

In 1871 Lockwood established an independent office in Boston for the practice of mechanical engineering.

However, the death of his brother and partner in May and the Great Boston Fire in November 1872, which destroyed his office and records, led him to return to Providence in 1873, though he would keep his engineering office in Boston for another two years.

Though Lockwood now dealt directly with the management of the Quinebaug Mills, he did not end his engineering work.

In spring of 1875, he organized a new A. D. Lockwood & Company, to manage his manufacturing interests as well as engineering business, and moved his office to Providence.