Const. Bill Bentley was one of four RCMP officers who confronted Dziekanski at Vancouver International Airport in October 2007, stunning him several times with a Taser, before Dziekanski died on the floor of the terminal.
After the judge handed down the verdict on Monday afternoon in Vancouver Supreme Court, Bentley doubled over in tears.
Bentley's legal troubles began when he tried to explain during the 2009 Braidwood Inquiry the differences between what could be seen on amateur video and what he initially told homicide investigators.
He and Const. Kwesi Millington, Const. Gerry Rundel, and former corporal Benjamin (Monty) Robinson were charged with perjury in 2011.- Watch bystander's video of Robert Dziekanski
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At his trial the Crown alleged Bentley and the other officers colluded on their stories to homicide investigators and then lied at the inquiry to cover up the deception.
Bentley told investigators and wrote in his notes that the Polish immigrant grabbed a stapler and came at the officers screaming, was stunned and wrestled to the ground.
But a video, taken by a traveller, emerged one month later and contradicted some of Bentley's notes and statements.