Lyn Scully is a fictional character from the Australian soap opera Neighbours, played by Janet Andrewartha. The character made her first screen appearance during the episode broadcast on 20 October 1999, along with her family and remained a prominent feature within the show until late 2006. Andrewartha reprised her role for a brief return in 2008 and then returned permanently in August 2009. Lyn departed again on 26 May 2011, so Andrewartha could pursue new acting opportunities. She reprised the role again in 2016, 2017 and 2019.

The character was created along with her family, which initially included husband Joe (Shane Connor), eldest daughter Stephanie (Carla Bonner), second eldest Felicity (Holly Valance), and youngest daughter Michelle (Kate Keltie). The Scullys were introduced on 20 October 1999 following the departure of the Martin family. The Scullys were the first new family to be introduced to the show since 1996. Former Prisoner actress Janet Andrewartha was cast as the family matriarch Lyn. A year prior to her casting, she told her agent that she wanted an acting job that would keep her working in Melbourne. Six months later, her agent contacted her to ask whether she would take a role on Neighbours. Andrewartha talked with the producers and did a screen test, before accepting the part of Lyn.

Network Ten publicity describe Lyn as going under something of a transformation since first arriving in Erinsborough. Commenting that in her early days Lyn was a suburban earth mother who ran a home, a hairdressing salon and helped husband Joe out with his business. Then stating that she turned into a woman determined to seek revenge after being hurt by her former lover Paul Robinson (Stefan Dennis). When Lyn returned in 2009 she had changed dramatically, she became less passive and more willing to put up a fight. Andrewartha commented on these changes stating: "She's less passive than she was, which is a good thing. She always gives something a go and that impresses me. Although she's making enormous mistakes since coming back to the street, she's always well intentioned." She was also impressed by the way they changed her over the period of time she was off-screen stating: "I quite like the way they've done that. As happens in life, one meets people one hasn't seen in a few years, and they perhaps have a harder edge to them and life has treated them rather roughly. You see a world weariness about them and more fight than they had."

Lyn also gained tendencies that mirrored Paul's personality and she became more feisty and willing to fight her enemies. "Certainly some of his toughness and his more brittle attitude to life have rubbed off on Lyn [...] there's more worldliness about her. She's not quite as gullible as she was. She's much more feisty and willing to fight. I think that all started with her falling in love with Paul and admiring those qualities in him." Andrewartha has stated that if Lyn could choose to be with any of her previous men, she would choose Joe Mangel (Mark Little).

During an interview on the BBC website, Andrewartha was asked if she was happy with her character's dramatic changes in clothing style and she stated that: "We had a change of designer and I couldn't have been more thrilled. I feel a little bit more comfortable in her gear now. I love the way she's constantly changing. I believe one of the really main essences of soap is change and we shouldn't be afraid to alter things. I'm all for change."

Andrewartha left Neighbours in August 2006, with Lyn's on screen departure occurring 7 December 2006. Andrewartha made two returns to the show, one in January 2008 and shown in May of that year. In 2009, Neighbours' script editor Pete McTighe teased of a potential return: "Watch this space. You'll see an old favourite return to the street in the second half of 2009. Who I've missed like mad!" It was later announced that Andrewartha had agreed to return originally contracted for three months, this was later extended to six months. She was later contracted further meaning she would be appearing on a long-term recurring basis. In March 2010, Andrewartha told Channel Five's Holy Soap website that she would be staying with the show for another year as a series regular.

In April 2011. TV Week revealed that the character was to leave Neighbours. Of her decision to leave, Andrewartha said "I originally came back in a guest role and ended up staying for nearly two years, so the extra time has been a bonus. It's been tremendous fun and I'll miss it, but it's time to try some new things."

Andrewartha reprised her role again in late 2015. Andrewartha had returned to the theatre following her 2011 exit, and she admitted that she had not thought about Neighbours until she was asked to come back. She stated, "It's always lovely catching up with older cast as we have shared so many story lines. However, it is also lovely to work with the new cast as well, including my new grandson and of course reconnecting with my daughter Carla [Bonner]. She still calls me 'Mamma'!" Lyn returns to Erinsborough during the episode broadcast on 1 February 2016. She comes to see Steph, who has moved back to the town after a stay in a psychiatric hospital. Lyn also wants to help Steph reconnect with her son Charlie Hoyland (Xander McGuire).