Parker Posey first appeared in the 1991 television film ‘First Love, Fatal Love.’ In 1993, she made her big-screen debut in the American science-fiction comedy film ‘Coneheads’ directed by Steve Barron. Despite receiving a mixed response from critics, the film tanked at the box office. That same year, she also appeared in the American coming-of-age comedy film ‘Dazed and Confused’ where she played the role of ‘Darla Marks.’ The film received positive reviews from critics but failed to achieve success at the box office. Nevertheless, the film gained a cult status in the subsequent years. She next appeared in films like ‘Mixed Nuts’ (1994), ‘Amateur’ (1994), ‘Final Combination’ (1994), ‘Party Girl’ (1995), ‘The Doom Generation’ (1995), ‘Kicking and Screaming’ (1995), ‘Frisk’ (1996), ‘subUrbia’ (1996), and ‘Basquiat’ (1996). In 1997, she received the ‘Satellite Award’ nomination for her performance as "Jackie-O" Pascal in the American dark comedy film ‘The House of Yes’ directed by Mark Waters. The film received a mixed response from critics.
In 2000, she starred as ‘Jennifer Jolie’ in the American meta slasher film ‘Scream 3’ directed by Wes Craven. The film opened to mixed reviews and was a major box office success, earning over $161.8 million against a budget of $40 million. Posey also bagged the ‘MTV Movie Award’ nomination for her performance in the film. She next starred in films like ‘The Anniversary Party’ (2001), ‘Josie and the Pussycats’ (2001), ‘Personal Velocity’ (2002), ‘A Mighty Wind’ (2003), ‘Blade: Trinity’ (2003), ‘Laws of Attraction’ (2004), ‘Adam & Steve’ (2005), ‘For Your Consideration’ (2006), ‘Superman Returns’ (2006), ‘Broken English’ (2007), ‘The Eye’ (2008), ‘Spring Breakdown’ (2009), ‘Happy Tears’ (2010), and ‘Inside Out’ (2011). In 2012, she was seen playing the role of ‘Susan Felders’ in the comedy film ‘Price Check’ directed by Michael Walker. The film saw its premiere at the Sundance Film Festival and received mostly positive reviews from critics. She continued to appear in films like ‘And Now a Word From Our Sponsor’ (2013), ‘Grace of Monaco’ (2014), ‘Ned Rifle’ (2014), ‘Irrational Man’ (2015), ‘Café Society’ (2016), ‘Mascots’ (2016), ‘Columbus’ (2017), and ‘The Con Is On’ (2018).
In 2018, Posey joined the main cast of the American science fiction streaming television series ‘Lost in Space’ where she played the role of ‘Dr. Smith / June Harris.’ The show aired its final episode in 2021. She was last seen in the Episode: "Uptown" of the American romantic comedy television series ‘High Fidelity’ in 2020. She is all set to appear in the upcoming American comedy horror film ‘Disappointment Blvd.’