Harriet "Hatti" Archer (née Dean; born 2 February 1982) is a British long-distance runner who competes in cross country and steeplechase.

She set three British national records in the 3000 metres steeplechase in 2007, most notably at a rain soaked event at Don Valley Stadium in July of that year.

Archer earned selection in the 3000 metres steeplechase for the 2008 Olympic Games in Beijing, but was unable to compete due to a stress fracture to her ankle.

[2] In July 2010, she ran in the 3000 metres steeplechase at the European Championships in Barcelona, finishing fourth in the final in a time of 9:30.19, eight seconds quicker than her previous best.

Marta Domínguez, who finished second in the race was disqualified in November 2015 due to doping offences, handed a three-year ban and stripped of all medals and results achieved between 5 August 2009, and 8 July 2013.