Sinead O'Connor (also Shelby and Roscoe) is a fictional character from the British Channel 4 soap opera, Hollyoaks, played by Stephanie Davis. The character first appeared during the episode broadcast on 1 September 2010. Sinead is a member of the O'Connor family, who were introduced as part of a cast turnover. Producers devised a "Romeo and Juliet" pairing for Sinead and Bart McQueen (Jonny Clarke).

Davis was fired from the show in July 2015 after poor behaviour on-set and Sinead departed during the episode broadcast on 18 September 2015. Davis's reintroduction was announced in May 2018, and the character returned on 23 October that year. In November 2019, Davis announced that she had decided to take a break from the show, having made her last appearance on 18 September of the same year. Nine months later, Davis announced on 15 June 2020 that she had opted to not return to the show following the break.

In 2010, Davis appeared as a contestant on BBC talent contest Over the Rainbow. When she departed the competition Hollyoaks contacted her agent requesting that she audition for the show. Davis gave up her pursuit of stage work to star as Sinead. She later told Dawn Collinson from the Liverpool Echo that "I definitely, 100% made the right decision, it’s Hollyoaks all the way". Sinead was created during producer Paul Marquess's "radical makeover" of Hollyoaks. Marquess first mentioned the family during a May 2010 interview with Kris Green from Digital Spy. He revealed that "something shocking happens to them really early on".

Davis's casting was publicised in June 2010, alongside the announcement of the O'Connor family. Green reported that Davis was joined by Gary Cargill and Alex Fletcher playing Sinead's father Rob and stepmother Diane O'Connor respectively, while the role of sibling Finn O'Connor had been given to Connor Wilkinson. Green added that the family would be under threat from Diane's desire to conceive a child via IVF. Marquess was excited about the family because they would bring a "dramatic storyline" to the show.

In July 2012, Hollyoaks teamed up with L'Oréal Paris to promote their "Feria hair colour" brand and in exchange give Sinead a make-over. The cosmetic company announced the news via their website stating that they had transformed Sinéad's hair "from glossy brunette into fiery red". The character was shown wanting a new look prior to a trip to Abersoch to "give herself an extra boost of confidence". Hollyoaks also released a video to profile Davis having the treatment applied to her hair.

Davis later told a reporter from K9 magazine that she liked Sinéad's "feisty nature" but felt she became quieter in 2012.

Sinead begins a romance with Bart McQueen (Jonny Clarke) but Diane does not approve. They decide that the only solution to be together is running away. Davis told Collinson that Diane does not want Bart in Sinead's life so they go to Wales. To begin with they find excitement in staying in a bed and breakfast but "then obviously as time goes on it gets a lot harder". As the money runs out they start struggling. She stated that the only good thing for Bart and Sinead is that they have each other, forming a "Romeo and Juliet" pairing. They take jobs at a fairground but they find themselves in a predicament as they "bicker" but ultimately reconcile due to love. Diane tracks them down and attempts to convince Sinead to return home. Davis explained that the duo have "got no money, they’re hungry, Sinead just wants a bath and to see her friends. It's a cliffhanger whether she goes home and has all those luxuries and doesn’t get to be with Bart, or she stays with nothing."

Davis sympathised with her character because she understood the feeling of wanting to be with someone who may not be suitable. Off-screen she had formed a good rapport with Clarke, claimed to know him "inside out" and therefore did not find their kissing scenes weird to film. She added that extras working on the show believe their on-screen chemistry so much that they suggested they should be together in reality.