The suit by Bryant Moore claimed that Cameron had used his screenplays and drawings to create the 2009 blockbuster.
It was the third such case to be dismissed in the past year with separate claims brought by Gerald Marowski and by Eric Ryder dismissed on the basis Cameron independently created "Avatar."
"Sadly, a cottage industry has arisen of fortune hunting plaintiffs seeking to 'strike it rich' by claiming their ideas were the basis for 'Avatar,'" Cameron said. "As I have previously stated, 'Avatar' was my most personal film, drawing upon themes and concepts that I had been exploring for decades. Our film was also the product of a team of some of the world's most creative artists and designers, and it is an insult to all of them when these specious claims are made."
"I am grateful that Judge Titus and the other jurists who have dealt with these cases have recognized the complete lack of merit of these offensive lawsuits."
Cameron announced last month that he will make his next three "Avatar" films for 20th Century Fox in New Zealand. He expects the films to be released on the previously announced dates of December 2016, December 2017 and December 2018.
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