The 31 members of the Organization for Economic Cooperation and Development on Monday unanimously voted in favor of accepting Israel as a member of the group, a senior Jerusalem source said.
Israeli officials have said acceptance would be an important stamp of approval for the country's economy, boosting its credit rating and strengthening ties with foreign investors.
Foreign Ministry officials earlier said that Palestinians had intensified their efforts to keep Israel out of the organization in recent days, saying that Israel infringes on Palestinians' human rights and violates OECD values.
Israel says Palestinian Prime Minister Salem Fayyad called many of the leaders of OECD countries over the past day to argue against Israel's acceptance.