ABU DHABI, May 23 (Reuters) - Abu Dhabi's economy, the largest in the United Arab Emirates, is showing signs of recovery on the back of heavy government spending, an Abu Dhabi official said on Tuesday.

"The government is spending heavily on projects. These are signs of economic recovery," Khalifa al-Mansouri, undersecretary of the Department of Economic Development in Abu Dhabi, told reporters, adding that spending was focused on tourism and infrastructure.

Mansouri predicted the emirate's gross domestic product would grow 3 percent this year and 4 percent in 2018, after growth of roughly 3 percent last year. Average growth in the last five years was 4.1 percent, he said.

The forecast appears more optimistic than that of the International Monetary Fund, which has forecast the UAE will see GDP growth slowing to 1.3 percent this year because of a shrinking oil sector in Abu Dhabi, as the UAE cuts oil output in line with a supply agreement among global producers.

(Reporting by Stanley Carvalho; Writing by Andrew Torchia) ((andrew.torchia@thomsonreuters.com; +9715 6681 7277; Reuters Messaging: andrew.torchia.thomsonreuters.com@reuters.net))