| Election Name: | 2024 Ohio Democratic presidential primary |
| Country: | Ohio |
| Type: | primary |
| Ongoing: | no |
| Previous Election: | 2020 Ohio Democratic presidential primary |
| Previous Year: | 2020 |
| Outgoing Members: | KS |
| Election Date: | March 19, 2024 |
| Elected Members: | LA |
| Next Election: | 2028 Ohio Democratic presidential primary |
| Next Year: | 2028 |
| Votes For Election: | 143 delegates (127 pledged and 16 unpledged) to the Democratic National Convention |
| Image1: | File:Joe Biden presidential portrait (cropped).jpg |
| Candidate1: | Joe Biden |
| Color1: | 224192 |
| Home State1: | Delaware |
| Popular Vote1: | 461,558 |
| Percentage1: | 87.06% |
| Delegate Count1: | 124 |
| Candidate2: | Dean Phillips (withdrawn) |
| Color2: | FE9900 |
| Home State2: | Minnesota |
| Popular Vote2: | 68,629 |
| Percentage2: | 12.94% |
| Delegate Count2: | 3 |
| Map Size: | 250px |
The 2024 Ohio Democratic presidential primary took place on March 19, 2024, as part of the Democratic Party primaries for the 2024 presidential election. 143 delegates to the Democratic National Convention will be allocated to presidential candidates.[1] The contest was held alongside Arizona, Illinois, and Kansas.
President Biden won every county; but, despite having already dropped out, Dean Phillips won three delegates. Congressman Phillips was still on the ballot on election day and gained his delegates by meeting the 15% threshold of votes needed to receive a delegate in a congressional district in the state's 2nd, 6th, and 14th districts.[2]
The filing deadline for the Ohio primary was on December 20, 2023, and the office of the Secretary of State of Ohio published the list of certified candidates on January 9, 2024.[3]
| Poll source | Date(s) administered | Sample size | Margin | Joe Biden | Robert F. Kennedy Jr. | Dean Phillips | Marianne Williamson | Other / Undecided | |||
|---|---|---|---|---|---|---|---|---|---|---|---|
| style=border-right-style:hidden | style=border-right-style:hidden | March 6, 2024 | Phillips suspends his candidacy | ||||||||
| style=border-right-style:hidden | style=border-right-style:hidden | February 7, 2024 | Williamson suspends her campaign | ||||||||
| Emerson College[4] | Nov 10–13, 2023 | 351 (LV) | ± 3.0% | 61% | – | 2% | 7% | 30% | |||
| style=border-right-style:hidden | style=border-right-style:hidden | October 27, 2023 | Phillips announces his campaign | ||||||||
| Ohio Northern University[5] | Oct 16–19, 2023 | 256 (LV) | ± 3.8% | 62% | – | – | 6% | 32% | |||
| style=border-right-style:hidden | style=border-right-style:hidden | October 9, 2023 | Kennedy withdraws from the primaries | ||||||||
| Ohio Northern University[6] | Jul 17–26, 2023 | – (LV) | – | 60% | 15% | – | 3% | 22% | |||
| Suffolk University[7] | Jul 9–12, 2023 | 152 (RV) | – | 67% | 13% | – | 3% | 17% | |||