A Four Corners investigation that uncovered animal mistreatment in the greyhound racing industry has won the coveted Gold Walkley Award.

ABC journalists have taken out several categories at the Walkley Awards for excellence in journalism in Melbourne on Thursday night, with Fairfax and News Corporation journalists and reports also recognised.

Caro Meldrum-Hanna, Sam Clark and Max Murch also won the investigative journalism award for their Four Corners report on the greyhound industry.

The Walkley Awards judges said the Making a Killing report exposed the greyhound racing industry's "ugly secret".

"It took bravery, tenacity and months of planning in three states to produce a jaw-dropping report that has shaken not just the greyhound code but the entire racing industry," the judges said.

Huw Parkinson won the multimedia storytelling award for his Insiders video mash-ups in which he inserted Australian politicians into popular films and television programs.

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The ABC National Reporting Team's Mark Willacy and Mark Solomons won the Walkley for news and current affairs in the radio/audio journalism category for their Hopeland report for PM.

Radio National's Hagar Cohen won the award for documentary, feature, podcast or special with her Left in Harm's Way report for Background Briefing.

The 7-Eleven: The Price of Convenience report, which was the result of a joint investigation between Four Corners, ABC TV and Fairfax Media, won Klaus Toft, Adele Ferguson and Sarah Danckhert the Walkley in the business category.

The report was recognised as a "complicated undertaking involving leaked documents, whistle blowers and surveillance".

Louie Eroglu won the camerawork award for his vision in The Killing Season — the product of filming over nine months — and The Great Cricket Coup.

He was praised by judges for his "sharp-eyed lighting and camerawork".

Judges awarded 7.30 reporters Matt Brown, Suzanne Dredge and Matthew Marsic the daily current affairs award for television/audio-visual journalism for their Enslaved by Aussie Jihadis report.

The Walkley Awards celebrated its 60th anniversary after being established in 1956 by Sir William Gaston — the founder of Ampol Petroleum.

The full list of winners can be viewed at The Walkley Foundation website.