The 33-year-old starred in Shortland Street and Spartacus: Blood and Sand.
Several outlets, including the LGBTQ website Queer Screen Australia and the Daily Mail posted the news of his death on Saturday.
"Queer Screen was saddened to hear of the passing of actor, Frankie Mossman," a post on its Facebook page read.
"Moving from Auckland to Sydney in 2012, Frankie was a well-known member of our LGBTIQ+ community, appearing in numerous NZ and Australian productions including the Sydney made gay web series, The Horizon.
"Frankie was a great friend of Queer Screen, starring in our MGFF16 trailer and was always an enthusiastic audience member at our festivals. Our sincere condolences to all his friends and family. May he Rest In Peace."
In 2020, Mossman starred in the short film Dis-Connect. He played Taylor in Shortland Street in the mid-2000s.
His friends and followers paid tribute to the actor in the comments of his social media posts.
Colin Mathura-Jeffree wrote: "Just so so sad to hear the news. Strangely you have been in my thoughts these past 3 days. Fly High...."
Australian dancer and entrepreneur Peter Oxford wrote: "I am so sorry to hear you have left us. I was only talking to you this week about going back to NZ."
"RIP beautiful Frankie. You will be missed," another commented.
Where to get help
• Lifeline: 0800 543 354 (available 24/7)
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• Rainbow Youth: (09) 376 4155
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