The actress, who played Vera Duckworth for more than 30 years, died peacefully, her family said.
Antony Cotton - the soap's Sean Tully - wrote on Twitter: "I'm devastated. Liz was a wonderful actress, a fascinating storyteller, a hilarious comedian and most importantly a brilliant friend.
"For many people of my generation, Jack and Vera WERE Coronation Street."
He added: "A light had gone out in Weatherfield a few years ago, but now Manchester too, has lost a little of its sparkle."
Kym Marsh - who plays Michelle Connor - wrote: "Just heard the terrible news of our lovely Liz Dawns passing. I'm so sad. What a wonderful lady. She will be so missed. Love to her family x
Actor Kevin Kennedy, who played Corrie character Curly Watts for around 20 years, said he can only smile when he thinks of the actress.
He told ITV's This Morning: "It's very sad. We are a big family. I was thinking about what to say about Liz. My thoughts go out to Don and her family. When I think about Liz, I always have a smile on my face. What an amazing legacy. That's what we've got to be thinking about today - her wonderfulness and a very funny actress."
"She took all the youngsters (on the show) under her wing. She was a lot cleverer than people thought she was, in regards to acting. She was brilliant. She was very humble in that respect. I used to live very close to her and she was always inviting us round to the house. We used to have a laugh. She was the one you could go to for advice."
He added that watching her and Bill Tarmey as a double act was "comedy gold and British comedy and British writing at it's best".
He ended saying: "I can only smile when I think of Liz. I can't think of a better epitaph. It is very sad but what she's left behind her is invaluable."
Charlie Condou - who played midwife Marcus Dent - wrote: "Vera Duckworth was classic Corrie. Liz Dawn was a wonderful woman. She will be truly missed. A true icon."
Shayne Ward wrote: "RIP Liz Dawn."
Corrie and Emmerdale star Chris Bisson wrote: "Very sad to hear the news that Liz Dawn has passed away. A wonderful person, amazing actress and total LEGEND! Keep smiling down on us Liz."
Emmerdale's Danny Miller wrote: "Devastated to hear about the passing of Liz Dawn. A beautiful soul. Inside and out. Rest in peace."
Tony Blackburn wrote: "So sorry to hear the news that Liz Dawn has passed away. Thanks for the hours of fun on Coronation Street you gave me RIP."
Allo Allo! star Vicki Michelle wrote: "RIP Liz Dawn a true #Corrie legend @itvcorrie @ITV Fabulous actress and loved by the nation. Sad news."