Duff may refer to:

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Michael Andrew "Duff" McKagan (born February 5, 1964) is an American musician and writer. He is best known for his twelve-year tenure as the bassist of the hard rock band Guns N' Roses, with whom he achieved worldwide success in the late 1980s and early 1990s. During his later years with the band, he released a solo album, Believe in Me (1993), and formed the short-lived supergroup Neurotic Outsiders.

Following his departure from Guns N' Roses in 1997, McKagan briefly reunited with his pre-success Seattle punk band 10 Minute Warning. He then formed the still-active hard rock band Loaded, in which he performs lead vocals and rhythm guitar. Between 2002 and 2008, he played bass in the supergroup Velvet Revolver with his former Guns N' Roses band mates Slash and Matt Sorum. He joined Jane's Addiction for a brief tenure in 2010. He was inducted into the Rock and Roll Hall of Fame in 2012 as a member of Guns N' Roses.

In addition to his musical career, McKagan has established himself as a writer. He has written weekly columns on a wide variety of topics for SeattleWeekly.com,Playboy.com, and ESPN.com. A former high school drop-out, he attended Seattle University's Albers School of Business and Economics in the early 2000s, and subsequently founded the wealth management firm Meridian Rock.

Hilary Erhard Duff (born September 28, 1987) is an American actress, author, entrepreneur and recording artist. Born and raised in Houston, Texas, Duff appeared in local theatre plays and television commercials before coming to prominence in the title role of the Disney Channel's teen comedy Lizzie McGuire and The CW's teen drama Gossip Girl as movie star Olivia. Established as a teen idol, Duff reprised that role in the The Lizzie McGuire Movie and subsequently ventured into motion pictures, appearing in a string of successful films that include Agent Cody Banks, Cheaper by the Dozen, A Cinderella Story and Cheaper by the Dozen 2. Most recently, she has performed in a legion of television dramas and independent films.

Duff expanded her repertoire to include pop music and has released three RIAA-certified platinum albums including Metamorphosis (2002), her debut studio album which was certified triple platinum, Hilary Duff (2004) and Most Wanted (2005), which were both certified platinum. Her most recent studio album Dignity (2007) was certified gold and spawned her highest charting US single to date "With Love". Followed by Best of Hilary Duff (2008), a compilation of her greatest hits, Duff has since sold thirteen million albums worldwide.

Brooke Duff is a New Zealand born recording artist and songwriter. She was discovered by Illegal Musik executives, who eventually signed her to the record label, along with its counterpart Warner Music Group. Duff released her debut single, "Til The End" in July 2012, which managed to chart on the New Zealand Singles Chart.

Brooke Duff was born in Christchurch, New Zealand in 1990 or 1991. Duff has been singing since the age of ten through her Church, but she moved to Australia for her career. She was recognized while she was singing at Melbourne’s Beaumaris Theatre with a school production, and was the lead role in ‘Patsi’ and the role of Wendy in ‘Peter Pan’. At the same time, she was selected as one of 50 youth singers from around Australia to form the Australian Youth Choir in 2003. According to sources, she is Christian. She was brought to the attention of Illegal via mutual friends in late 2009 and Head of A&R, Mark Arona, opted for a long-term strategic approach to her career development. She had attended Riccarton High School in Christchurch.

Haylie Katherine Duff (born February 19, 1985) is an American actress, singer-songwriter and food blogger. She is the older sister of actress and singer-songwriter Hilary Duff. She is best known on her role as Sandy Jameson in the television series 7th Heaven, and as Annie Nelson in the made for television films Love Takes Wing and its sequel Love Finds a Home.

Duff was born in Houston, Harris County, Texas. She is two and a half years older than her sister, Hilary. Duff's mother, Susan Colleen (née Cobb) is a homemaker and film producer (co-executive producer of A Cinderella Story (2004) and producer of The Perfect Man (2005) and Material Girls (2006), as well as the manager of her sister Hilary). Her father, Robert Erhard 'Bob' Duff, is a partner and owner in a chain of convenience stores with father John B. Duff and who resides at the family home in Houston to maintain the family's business. She began her acting career as an offshoot of her early dance training. Growing up in Texas, Duff began ballet at an early age. By age ten, Duff landed a role in the Houston Metropolitan Dance Company’s production of The Nutcracker.