U.S. District Judge William Bertelsman declared the mistrial Friday after jurors couldn't reach a verdict.
Former cheerleader and high school teacher Sarah Jones had sued Scottsdale, Ariz.-based thedirty.com and its operator over two posts that said she had slept with every Bengals player and likely had two sexually transmitted diseases.
She was seeking $11 million.
The posts were unrelated to Jones' relationship with her former 17-year-old student. Jones pleaded guilty in that case in October in a deal that allowed her to avoid jail time. The two are still dating.