| Election Name: | 1914 United States Senate election in Arizona |
| Country: | Arizona |
| Type: | Presidential |
| Ongoing: | no |
| Previous Election: | 1912 United States Senate elections in Arizona |
| Previous Year: | 1912 |
| Next Election: | 1920 United States Senate election in Arizona |
| Next Year: | 1920 |
| Election Date: | November 3, 1914 |
| Nominee1: | Marcus A. Smith |
| Party1: | Democratic Party (United States) |
| Popular Vote1: | 25,800 |
| Percentage1: | 53.23% |
| Nominee2: | Don Lorenzo Hubbell |
| Party2: | Republican Party (United States) |
| Popular Vote2: | 9,183 |
| Percentage2: | 18.95% |
| Nominee3: | Eugene W. Chafin |
| Party3: | Independent (United States) |
| Popular Vote3: | 7,293 |
| Percentage3: | 15.05% |
| Nominee4: | Bert Davis |
| Party4: | Socialist Party (United States) |
| Popular Vote4: | 3,582 |
| Percentage4: | 7.39% |
| Nominee5: | J. Bernard Nelson |
| Party5: | Progressive Party (United States, 1912) |
| Popular Vote5: | 2,608 |
| Percentage5: | 5.38% |
| Map Size: | 210px |
| U.S. Senator | |
| Before Election: | Marcus A. Smith |
| Before Party: | Democratic Party (United States) |
| After Election: | Marcus A. Smith |
| After Party: | Democratic Party (United States) |
The 1914 United States Senate election in Arizona was held on Tuesday November 3, Incumbent United States Senator Marcus Aurelius Smith was reelected to a second term defeating state senator Don Lorenzo Hubbell, the Republican nominee, in the general election by a wide margin. Several third party candidates also ran in the election including former Prohibition Party presidential candidate Eugene W. Chafin, Socialist nominee Bert Davis Socialist, and Progressive nominee J. Bernard Nelson.