Kelly Madison (born August 26, 1967 in Newport Beach, California, U.S.) is an American pornographic actress, director, producer, and Internet pornography entrepreneur -- perhaps best known for her very large-yet-natural breasts. Kelly Madison runs a production company, 413 Productions, with her husband Ryan.

Inspired by her cousin's (Janine Lindemulder) highly successful porn career, Kelly Madison and her younger, graphic designer husband  started an internet porn business. It started as just a personal website, due to initial concerns that: she had never posed nude before; and, she was starting in the business at a much higher-than-typical age (in adult entertainment, women can be considered to be 'too old' by their mid- or late-20's).

After the initial success of the website, they expanded into producing and filming pornographic DVDs (starring other performers). Their company was called 413 Productions, after the street address of the warehouse they rented for filming. The PornFidelity web site and a matching DVD line grew out of some threesome scenes with the couple and women that Madison brought home. The couple divided the business' responsibilities: Ryan handled the production company; editing and photographing; web hosting; programming; advertising; and traffic generation. Kelly handled talent booking; arranging sets; company finances; and promotions.

Kelly Madison has made extensive appearances for Danni Ashe, including appearing in several DVDs for "Danni Ashe Presents" (softcore), and "Danni HardCut" (hardcore), and being June 2006 "DanniGirl of the Month" on the Danni's Hard Drive website. She has also appeared in Score magazine, and she writes a column for Juggs magazine. She was nominated for the 2007 F.A.M.E. "Favorite Breasts" award.

Kelly Madison has started a series of pornographic web sites. KellyMadison.com focuses on her public appearances. PornFidelity.com focuses on threesomes, swinging with her husband, and women that she brings home. KellyFind.com is a pornographic search engine, specializing in searches for specific types of performers (by ethnicity, hair color, bust size, age, sex acts-performed, etc.). KellyCash.com is an affiliate program for the first two sites, replacing 413dollars.com in mid-2006.

On July 25, 2007, Kelly Madison and her husband Ryan were interviewed on the E! channel Chelsea Lately television program. They discussed their marriage, their open relationship, and pornographic career. She is nominated for the 2009 AVN Awards for Web Starlet of the Year and MILF/Cougar Performer of the Year.

Kelly Madison's father was an actor and stunt man and her mother was an accountant; she has two older sisters. Kelly Madison met her husband, Ryan, in 1999 at a computer graphics company: she was the (32-year-old) vice president of sales; he was a (22-year-old) graphic designer. Despite their age difference, and Kelly's engagement to another man, they fell in love, and eloped.