and February 2009. The aim of the study was to determine the prevalence of infected livers with fascioliasis and to evaluate the economic loss due to the condemnation of livers infected with fascioliasis. A total of 3,457 cattle, 6,161 sheep and 5,764 goats were slaughtered and examined in El Tarf abattoir, north Algeria (humid climate), and 2,151 cattle, 5,724 sheep, 351 goats and 582 camels in Ouargla abattoir, south Algeria (saharan climate). In El Tarf region, the prevalence of fascioliasis infection was 26.7±2.5%, 6.5±0.4% and 2.5±0.2% in cattle, sheep and goats, respectively (P< 0.001). In Ouargla region, fascioliasis is reported for the first time in cattle (1.7±0.7%). Sheep, goats and camels were not infected. The overall economic loss due to hepatic condemnations as a result of fascioliasis was estimated at 60,000 euros in El Tarf region and 4,000 euros in Ouargla region. According to this study, it can be concluded that fascioliasis is endemic in the northern Algeria in ruminants and, the disease should be considered seriously as a great threat to ruminant health and profitability.