Adolf Valentin "Adi" Lindfors (8 February 1879 – 5 May 1959) was a heavyweight Greco-Roman wrestler from Finland.
He competed at the 1912, where we became injured and had to withdraw, and 1920 Olympics, where he won a gold medal, aged 41.
Lindfors started seriously training in sports around 1900, and won Finnish titles in weightlifting in 1903–04 and in Greco-Roman wrestling in 1905, 1910 and 1913.
He placed second at the 1911 World Championships.
Back in 1902 he founded Porvoon Akilles and headed it from 1902 to 1912.