Andreas Klier (born 15 January 1976) is a retired German professional road racing cyclist. He competed professionally between 1996 and 2013. Klier moved into a managerial role with his final professional team, Garmin–Sharp, after announcing his retirement as a rider on 13 May 2013. As of 2024 he remains a sports director with its successor team EF Education–EasyPost.

Born in Munich, Bavaria, West Germany, Klier currently resides in the Balearic Island of Mallorca. In April 2011, during a training ride, he avoided a collision with a car, from that moment onwards he had a bit of oak installed into his bike frame and thus could avoid accidents by touching wood. Bikes were sold with oak to raise money for the Plant for the Planet charity.

On 15 August 2013, Klier admitted he used performance-enhancing drugs between 1999 and 2006. As a result, some of his results, including a stage win at the 2007 Vuelta a España, were voided.

In addition to his career in cycling, Klier took up painting after seeing works by Max Beckmann at the Museum of Fine Arts, Boston during a layover on a business trip. His solo exhibition Alpha was held at the Gerhard Braun Gallery in Palma de Mallorca in 2023. Canvases sold for between 7,000 and 10,000 euros.