Lincoln Herndon Law Office

The Lincoln-Herndon Law Offices State Historic Site is a historic brick building built in 1841 in the U.S. state of Illinois. It is located at 6th and Adams Streets in Springfield, Illinois. The law office has been restored and is operated by the Illinois Historic Preservation Agency as a state historic site.

The office building is a surviving portion of what was the Tinsley Block, a brick structure built by local developer Seth M. Tinsley in 1840–1841 to provide office space for professionals working in the newly chosen state capital city. The Illinois General Assembly had moved the capital from Vandalia, Illinois to Springfield in late 1839, and local workers had begun to build a new limestone state house, now the Old State Capitol State Historic Site, on the parcel of land just north of the Tinsley Block.