Lajos Bíró (born Lajos Blau) (22 August 1880 – 9 September 1948) was a Hungarian novelist, playwright, and screenwriter who wrote many films from the early 1920s through the late 1940s. He was born in Nagyvárad, Austria-Hungary (now Oradea, Romania) and eventually moved to the United Kingdom where he worked as a scenario chief for London Film Productions run by Alexander Korda. He died in London on 9 September 1948 of a heart attack. He is buried in Hampstead Cemetery.
In 1929, he was nominated for an Academy Award for Best Original Writing for The Last Command, but lost to Ben Hecht for Underworld, the only other nomination in this category.