Colin Andrew Firth (born 10 September 1960) is an English actor and producer. He was identified in the mid-1980s with the "Brit Pack" of rising young British actors, undertaking a challenging series of roles, including leading roles in A Month in the Country (1987), Tumbledown (1988) and Valmont (1989). His portrayal of Mr. Darcy in the 1995 television adaptation of Jane Austen's Pride and Prejudice led to widespread attention, and to roles in more prominent films such as The English Patient (1996), Shakespeare in Love (1998), Bridget Jones's Diary (2001), The Importance of Being Earnest (2002), Girl with a Pearl Earring (2003), Richard Curtis's romantic comedy ensemble film Love Actually (2003), and the musical comedy Mamma Mia! (2008) and its sequel, Mamma Mia! Here We Go Again! (2018).

In 2009, Firth received international acclaim for his performance in Tom Ford's A Single Man, for which he won a BAFTA Award and received his first Academy Award nomination. In 2010, his portrayal of King George VI in Tom Hooper's The King's Speech won him the Academy Award for Best Actor. He subsequently appeared as MI6 agent Bill Haydon in Tinker Tailor Soldier Spy (2011), and as secret agent Harry Hart in Kingsman: The Secret Service (2014) and its sequel Kingsman: The Golden Circle (2017). He has since appeared in the musical fantasy Mary Poppins Returns (2018), and Sam Mendes' war film 1917 (2019), and Supernova (2020). He is also known for his performances in television including the BBC film Conspiracy (2001), and HBO's The Staircase (2022), receiving Primetime Emmy Award nominations for each.

In 2012, he founded the production company Raindog Films, where he served as a producer for Eye in the Sky (2015) and Loving (2016). His films have grossed more than $3 billion from 42 releases worldwide. Firth has campaigned for the rights of indigenous tribal people and is a member of Survival International. He has campaigned on issues of asylum seekers, refugees' rights and the environment. He commissioned and co-authored a scientific paper on a study of the differences in brain structure between people of differing political orientations.

He is the recipient of various accolades, including an Academy Award, two British Academy Film Awards, a Golden Globe Award, and three Screen Actors Guild Awards. In 2011, Firth was appointed a CBE by Queen Elizabeth II at Buckingham Palace for his services to drama. That same year, he received a star on the Hollywood Walk of Fame, and appeared in Time magazine's 100 most influential people in the world.