| Election Name: | 2008 Delaware Republican presidential primary |
| Country: | Delaware |
| Type: | presidential |
| Ongoing: | no |
| Previous Election: | 2004 Delaware Republican presidential primary |
| Previous Year: | 2004 |
| Next Election: | 2012 Delaware Republican presidential primary |
| Next Year: | 2012 |
| Election Date: | February 5, 2008 |
| Color1: | ce5c17 |
| Nominee1: | John McCain |
| Home State1: | Arizona |
| Popular Vote1: | 22,628 |
| Percentage1: | 45.04% |
| Color2: | 85bb65 |
| Nominee2: | Mitt Romney |
| Home State2: | Massachusetts |
| Popular Vote2: | 16,344 |
| Percentage2: | 32.53% |
| Elected Members: | GA |
| Outgoing Members: | CT |
| Color3: | 990000 |
| Nominee3: | Mike Huckabee |
| Home State3: | Arkansas |
| Popular Vote3: | 7,706 |
| Percentage3: | 15.34% |
| Map Size: | 210px |
The 2008 Delaware Republican presidential primary was held on February 5 (Super Tuesday). A total of 18 delegates were selected. The Delaware Republican Party rallied behind John McCain, and he was the declared winner of the primary election after successfully taking all three Delaware counties. McCain was followed by Mitt Romney in second and then by Mike Huckabee in third.
Candidates Rudy Giuliani, Duncan Hunter, Fred Thompson, and Tom Tancredo had dropped out of the presidential race before the Delaware primary.
| Candidate | Votes | Percentage | Delegates | |
|---|---|---|---|---|
| John McCain | 22,626 | 45.04% | 18 | |
| 16,344 | 32.53% | 0 | ||
| 7,706 | 15.34% | 0 | ||
| 2,131 | 4.24% | 0 | ||
| Rudy Giuliani | 1,255 | 2.5% | 0 | |
| Tom Tancredo | 175 | 0.35% | 0 | |
| Total | 50,237 | 100% | 18 |
McCain was the expected favorite in the 2008 primary among the Republican candidates; his campaign was led by Delaware's only House representative, Rep. Michael N. Castle.
In Delaware, 27,412 of the 102, 455 registered Republicans voted in the election, resulting in a 26.76 percent turn-out rate.