There were elections in 1909 to the United States House of Representatives:
|- ! | Robert C. Davey | | Democratic | 1892<br/>1894 <br/>1896 | | Incumbent member-elect died during previous congress.<br/>New member elected March 30, 1909.<br/>Democratic hold. | nowrap |
|- ! | Theodore E. Burton | | Republican | 1888<br/>1890 <small>(lost)</small><br/>1894 | | Incumbent member-elect resigned during previous congress.<br/>New member elected April 20, 1909.<br/> Republican hold. | nowrap |
|- ! | William Lorimer | | Republican | 1894<br/>1900 <small>(lost)</small><br/>1902 | | Incumbent resigned June 17, 1909, after being elected to the U.S. Senate.<br/>New member elected November 23, 1909.<br/>Republican hold. | nowrap |
|- ! | Francis W. Cushman | | Republican | 1898 | | Incumbent died July 6, 1909.<br/>New member elected November 2, 1909.<br/>Republican hold. | nowrap |
|- ! | Pablo Ocampo | | Democratic | 1907 | | Term ended November 22, 1909.<br/>New delegate elected November 23, 1909.<br/>Nacionalista gain. | nowrap |