Isaac Williamson Scudder (1816 – September 10, 1881) was a U.S. Representative from New Jersey for one term from 1873 to 1875.

Born in Elizabethtown (now Elizabeth, New Jersey), Scudder completed preparatory studies.

He studied law, was admitted to the bar in 1838 and commenced practice in Elizabeth, New Jersey.

He was prosecutor of the pleas of Hudson County from 1845–1855, and was appointed as a member of the first police commission of Jersey City, in 1866.

He was appointed solicitor of the Pennsylvania Railroad for Hudson County, New Jersey, June 23, 1875.