DUBAI - Saudi Arabia's economy has slipped back into recession as the oil sector stagnates and the government sector is hit by austerity policies designed to curb a state budget deficit caused by low oil prices, official data showed on Saturday.

Gross domestic product, adjusted for inflation, shrank 2.3 percent from the previous quarter in the April-June period, after dropping 3.8 percent in the first quarter.

Economists generally define a recession as two straight quarters of shrinking GDP, measured by quarter-on-quarter rates. Saudi Arabia was last in recession -- a shallower one -- in early 2016.

A price-supporting agreement among global oil producers caused Saudi Arabia to reduce its oil output early this year, pulling down GDP. The oil sector shrank 1.8 percent from a year ago in the second quarter after a 2.3 percent fall in the first.

The agreement is due to run to the end of next March but OPEC and industry sources say they expect the output cuts to be extended further, so the Saudi economy may not get a boost from its oil sector for many more months.

Meanwhile, the government has curtailed spending to avoid a financial crisis due to lower oil export revenues. As a result, the non-oil state sector grew just 1.0 percent from a year ago in the second quarter after shrinking 0.1 percent in the first.

Without much support from state spending, the private sector has struggled. It grew only 0.4 percent from a year earlier in the second quarter, slowing from growth of 0.9 percent in the first quarter. [for a further breakdown of GDP figures, click

The government has said it plans a stimulus package in the fourth quarter of the year, including state loans and other financial incentives, to encourage private sector investment and growth.

The size of the package is not clear, however, and fresh austerity steps to eliminate the budget deficit by 2020 are likely to weigh on growth. Saudi Arabia plans to introduce a 5 percent value-added tax on many goods in January, and authorities are considering a rise in domestic fuel prices.

(Reporting by Andrew Torchia; Editing by Catherine Evans) ((; +9715 6681 7277; Reuters Messaging: