National Union (c. 1864) Thomas James Bigham (February 12, 1810 – November 9, 1884) was an American politician and abolitionist.

Born in Hannastown in Westmoreland County, Pennsylvania, on February 12, 1810, he studied law at Jefferson College.

After the Great Fire of Pittsburgh, he rallied for aid, and secured the relief in the amount of $50,000 via an impassioned speech in the Pennsylvania State Capitol.

In 1850, they moved to a Kirkpatrick family property located on a wooded plot in what is now the Chatham Village section of Mount Washington, where they raised five children.

[4] The house, a stop on the Underground Railroad, is now designated as a Pittsburgh historic landmark.