Bianca Jackson (also Butcher) is a fictional character from the BBC soap opera EastEnders, played by Patsy Palmer. The character was introduced by executive producer Leonard Lewis and appeared initially from 1993 to 1999, when Palmer opted to leave. In 2002 executive producer John Yorke brought the character back for a special spin-off show. She returned to EastEnders as a full-time character in April 2008. Palmer took maternity leave in late 2010 and Bianca left the series in January 2011. The character returned in December 2011 after Palmer signed a "working mums" contract, which granted her leave from the soap between April and November 2012. The actress quit EastEnders in 2014 and Bianca departed on 12 September 2014. Palmer reprised the role on 2 September 2019 for a guest stint and a second guest stint was scheduled for 2020, but later cancelled. Beginning in early 2024, Palmer reprised her role for just over a year, between 4 March 2024 and 17 April 2025.

During her first run on the show, in the 1990s, Bianca was known for her bizarre sense of style, sharp tongue and fiery temper, as well as her romantic chemistry with established character Ricky Butcher (Sid Owen); the two represent one of the show's most memorable relationships to date, which is best remembered for when Bianca often screams "Rickaaaaaaay!" whenever they argue with each other. She has also been featured in many central plot developments such as affairs, feuds, bereavements, family problems, spina bifida and having an abortion. Bianca's other storylines in her first stint have included her troubled relationships with parents Carol Jackson (Lindsey Coulson) and David Wicks (Michael French) along with their family members; an on-off friendship with childhood school-mate Natalie Evans (Lucy Speed); a more stronger companionship with best friend Tiffany Mitchell (Martine McCutcheon); a rivalry with Ricky's other spouse Sam Mitchell (Danniella Westbrook); a feud with Sam's older brother Grant (Ross Kemp) over his volatile marriage with Tiffany; and then cheating on Ricky when she has an affair with Carol's boyfriend Dan Sullivan (Craig Fairbrass), the latter of which culminates in her 1999 departure from the show. Since her 2008 return, her storylines have included coping with the discovery that her new fiancé Tony King (Chris Coghill) is a paedophile who sexually abused her adopted surrogate daughter Whitney Dean (Shona McGarty) in the past; remarrying Ricky for a second time; going to prison for assault and theft; battling with money problems; forming a close fellowship with companion Kat Slater (Jessie Wallace); having a short-lived romance with old lover Terry Spraggan (Terry Alderton); getting stalked by Tony's son Leo (Tom Wells); dealing with depression; exploring an ADHD diagnosis; seeking to exonerate her younger sister Sonia (Natalie Cassidy) after she is falsely accused of murder; being kidnapped by her sister's boyfriend Reiss Colwell (Jonny Freeman); and coming into loggerheads with Sonia's estranged father Terry Cant (Glen Davies).

In his book, EastEnders: The First 10 Years: A Celebration, EastEnders scriptwriter Colin Brake describes 1994 as a "historic" year for EastEnders, as in April, a third weekly episode was introduced. Due to the programme's increased frequency, a number of new characters were introduced to the regular cast in the latter part of 1993 and early 1994. Among them were the Jackson family, created by Tony McHale: mother, Carol (Lindsey Coulson), her four children, Bianca (Patsy Palmer), the oldest, Robbie (Dean Gaffney), Sonia (Natalie Cassidy), and Billie (Devon Anderson), the youngest, as well as Carol's partner, Alan Jackson (Howard Antony). Though Carol and Alan were not initially married in the serial, and though Alan was only the biological father of Billie, the whole family took on Alan's surname. It later transpired that David Wicks (Michael French) was Bianca's father. Various members of the family began to appear sporadically from November 1993 onwards, but in episodes that aired early in 1994, the Jacksons moved from Walford Towers, a block of flats, to the soap's focal setting of Albert Square. Their slow introduction was a deliberate attempt by the programme makers to introduce the whole family over a long period. The Jacksons have been described by Brake as a "classic problem family".

Future Spice Girl Emma Bunton auditioned for the role of Bianca; however, it was actress Patsy Palmer who was eventually cast. Hester Lacey of The Independent has described Palmer's casting as an "accident", as she did not formally audition for the role. EastEnders casting director Jane Deitch and writer–director McHale visited her drama class at the Anna Scher Theatre looking for a girl aged 16 or under. Palmer was not on the list of people they wanted to see as she was older, but she caught the attention of Deitch when she was messing around and giggling with friends. At the end of the class, Palmer was asked by McHale to do something, so Anna Scher asked her to improvise a monologue based on the line "I can't believe you just said that." The next day, Scher contacted Palmer to say she had been offered an audition. When she arrived at the audition, McHale told producers Palmer was 16 as she would have been refused the part. She was offered a three-month contract the same day. In 1996, Palmer commented to Lacey: "I've been a lucky girl. I always used to say I'd love to get in EastEnders, because I used to think 'God, I'll never get a part where I have to speak really posh', – I'm not very good at accents." Palmer was 21 when she first appeared on-screen as 16-year-old Bianca.

Bianca has been classified by Rupert Smith, author of EastEnders: 20 years in Albert Square, as a drama queen, a "strong passionate [woman]" and "Walford's trouble-maker-in-chief". She has also been described by Reuters as "feisty" and someone "who never minced her words". In 1996, Palmer described Bianca as someone who deserves "a good slap". She added, "I probably wouldn't like Bianca if I knew her in real-life. But I do love playing the character. She is so cheeky and gets to say outrageous things".

Deemed "a woman you would not want to cross" by James Rampton of The Independent, Bianca is a tenacious foe, but a loyal friend. The way the character is portrayed, as a "person who wouldn't take nonsense from anyone", has led Rampton to comment that she embodies "girl power", a cultural phenomenon of the mid-late 1990s. He added, "Bianca could sulk for Britain – and we adored her for it." However, Rampton also noted that underneath Bianca's bravado, the character is capable of showing "the most affecting vulnerability".

In her first six years in the soap, Bianca's storylines included affairs, feuds, bereavements, abortion, and a problematic marriage to Ricky Butcher.

Bianca's relationship with mechanic Ricky Butcher (Sid Owen) has been central to her narrative; their affiliation began in 1994. Palmer and Owen already knew each other before working together on the soap, as both attended the Anna Scher theatre school. Owen has said, "We practically grew up together. We'd known each other for years. It was weird when she started on the show and we began playing the 'Ricky & Bianca Get To Know Each Other' bit. I had already spent a lot of time with Patsy. I think we were both seven when we met."