The Sydney Opera House has illuminated its sails on Saturday night in a show of support for fire-hit communities around Australia and the firefighters defending them.

The display began about 8.30pm and saw scenes of hope from the last three months of the fire crisis projected onto the building’s famous sails, remaining lit until about 11pm.

Opera House honours the hard work of firefighters during the current bushfire season. Credit:Wolter Peeters

"We are lighting the Opera House sails to show our collective support for everyone affected by these devastating fires and to express our deepest gratitude to the emergency services and volunteers for their incredible efforts and courage," Opera House chief executive Louise Herron said.

"As difficult circumstances continue, we want to send a message of hope and strength to the people of Australia."