Amasa Cobb (September 27, 1823 – July 5, 1905) was an American politician and judge. He was the 6th and 9th Chief Justice of the Nebraska Supreme Court and the 5th Mayor of Lincoln, Nebraska. Earlier in his life, he was a United States Congressman from Wisconsin for 8 years and served as the 13th Speaker of the Wisconsin State Assembly. He also served as a Union Army officer during the American Civil War.