Mamelund played professionally in the German Bundesliga. He won the EHF Cup with HSG Nordhorn in 2007-08. Former clubs are Helset IF and Haslum HK. Mamelund has signed a transfer to the Danish Handball League side FCK Håndbold, which will be his club from July 2009.[2] On 19 August 2015 it was announced that Erlend Mamelund would join German side THW Kiel immediately on a one-year deal.[3]
He then finished his career at Haslum HK in 2017. He wore the Haslum jersey 311 times and scored 1811 goals in 13 seasons. He then signed a three-year deal as the assistant coach of Haslum from 2017 to 2020.
^Øen, Sindre (13 October 2006). "Misunnelig på lillebror". Budstikka (in Norwegian). Archived from the original on 10 August 2007. Retrieved 18 January 2009.