The Missouri Riverboat Gambling Amendment, also known as Amendment 3, was a legislatively-referred constitutional amendment on the April 5, 1994 ballot in Missouri, where it was defeated.
This amendment was a follow up to a 1992 Proposition that, while approved by the state's voters, was stopped by the state's Supreme Court under a ruling that games of chance can only become legal through changes to the state's constitution. 
A similar amendment was passed in November of the same year.
| Amendment 3 (Riverboat Gambling)|
|Yes|| 527,285|| 49.9%|
Results after recount via the Missouri State Archives, forwarded by email to Ballotpedia staff courtesy of David C. Valentine, Ph.D.
Note: The official results of the election were not listed in the State's Blue Book
Text of measure
The question asked on the ballot was:
- Shall the General Assembly be authorized to permit only upon the Mississippi River and the Missouri River lotteries, gift enterprises, and games of chance or skill to be conducted on excursion gambling boats and floating facilities? The fiscal impact will depend upon actions of the General Assembly, local governing bodies and voters.