| State Question 788 | |
| Oklahoma Medical Marijuana Legalization Initiative | |
| Yes: | 507,582 |
| No: | 385,176 |
| Total: | 892,758 |
| Mapcaption: | No: Yes: Other: |
| Notes: | Source: Oklahoma State Election Board |
Oklahoma Question 788, the Oklahoma Medical Marijuana Legalization Initiative, was a 2018 ballot measure on the June 26 ballot (alongside primaries for various statewide offices) to legalize medical marijuana in the state of Oklahoma. It passed with over 56% "yes" votes.
The proposal was listed on ballots as follows: