| Election Name: | 1968 United States Senate election in Alaska |
| Country: | Alaska |
| Type: | Presidential |
| Ongoing: | no |
| Previous Election: | 1962 United States Senate election in Alaska |
| Previous Year: | 1962 |
| Next Election: | 1974 United States Senate election in Alaska |
| Next Year: | 1974 |
| Election Date: | November 5, 1968 |
| Image1: | Mikegravel.jpg |
| Nominee1: | Mike Gravel |
| Party1: | Democratic Party (US) |
| Popular Vote1: | 36,527 |
| Percentage1: | 45.13% |
| Nominee2: | Elmer Rasmuson |
| Party2: | Republican Party (US) |
| Popular Vote2: | 30,286 |
| Percentage2: | 37.42% |
| Image3: | Senator Ernest Gruening (D-AK) (croppedmore).jpg |
| Nominee3: | Ernest Gruening (write-in) |
| Party3: | Democratic Party (US) |
| Popular Vote3: | 14,118 |
| Percentage3: | 17.44% |
| U.S. Senator | |
| Before Election: | Ernest Gruening |
| Before Party: | Democratic Party (US) |
| After Election: | Mike Gravel |
| After Party: | Democratic Party (US) |
The 1968 United States Senate election in Alaska took place on November 5, 1968. Incumbent Democratic U.S. Senator Ernest Gruening ran for a second full term in office but finished behind Speaker of the Alaska House of Representatives Mike Gravel in the Democratic primary. Gruening launched a write-in bid for the seat in the general election, but finished third to Gravel and Republican former Anchorage mayor Elmer Rasmuson.
Gravel would later lose the primary in 1980 to Gruening's grandson Clark.
This would be the first of 3 times where the incumbent holder of Alaska's Class 3 U.S. Senate seat was defeated in the primary while running for re-election.
Future Senator Ted Stevens also ran in the Republican primary, but lost to Rasmuson by around 1,000 votes. When incumbent Democratic Class 2 Senator Bob Bartlett died that December, Governor Wally Hickel appointed Stevens to the vacant seat, giving Stevens a seniority advantage of 10 days over the incoming Gravel.