The Australia forward, who moved to England when he was 15 and is married to a former British soap actress, quit Melbourne Victory in 2012 after just a year at the A-League club, opting to return to Britain for family reasons.
Kewell, Australia's most well-known footballer, had been signed until the end of the Qatar Stars League season, which ends in May, Al Gharafa said.
Al Gharafa are currently sixth in the Qatari league and are second in their group after three matches in the AFC Champions League, Asia's premier club tournament.
The deal could brighten Kewell's chances of making the Australia squad for three vital 2014 World Cup qualifiers in June.
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- Al Gharafa