The 2008 Montana Democratic presidential primary took place on June 3, 2008, with 16 delegates at stake.

The 16 delegates represented Montana at the Democratic National Convention in Denver, Colorado.

Early on the day of the primary, hours before polls closed, the Associated Press projected Barack Obama's nomination for the presidency.

The projection was based on the declarations of a large number of Democratic superdelegates, as well as exit polls of voters in South Dakota and Montana.

However, the AP calculated that Obama would be the presumptive Democratic nominee even if he lost the primaries in both South Dakota and Montana simply because he was so far ahead in the delegate count.