Joseph Dorr Clapp (December 31, 1811 – October 27, 1900) was an American banker, Democratic politician, and Wisconsin pioneer.

He served two years in the Wisconsin State Senate, representing Jefferson County.

J. D. Clapp was born in Westminster, Vermont, on New Year's Eve 1811.

In 1859, he started the Koshkonong Bank in partnership with Lucien B. Caswell.

His brother was Mark R. Clapp who served in the Wisconsin Territorial Legislature.