Was there ever a US 1 million dollar bill?

Sadly no. There has only been an 100,000 dollar been made. That is the highest amount of a dollar bill and it was never used in general circulation. The highest value bill in circulation was 10,000 dollars.

Several novelty companies make fake million dollar bills. They sell for a couple of bucks in toy and gift stores. A few people have tried to cash them and ended up being arrested and/or jailed.