LONDON—Diageo PLC reported lower operating profit for the year as the world's largest spirits maker logged lower revenue in North America, Asia and Latin America.

The maker of Johnnie Walker whisky and Smirnoff vodka reported its operating profit, excluding one-time items, fell 0.8% to £ 1.45 billion ($2.26 billion) while per-share earnings before one-time items dropped to 88.8 pence from 95.5 pence. On an organic basis, which strips out currency movements and acquisitions, net sales were flat as Diageo posted declines in North America, Asia Pacific, Latin America and the Caribbean. Sales in Europe were flat, while Africa was a relative bright spot with net sales rising 6%.

The results cap a tough couple of years for Diageo, which has lost market share in North America where once-blockbuster brands like Smirnoff and Captain Morgan have floundered. Diageo has also been hammered by weakness in Asia amid an anticorruption campaign in China and social unrest in Thailand, both of which have slowed demand in the region.

Including the impact of currency and acquisitions, Diageo reported a net profit of £ 2.38 billion for the year ended June 30, compared with £ 2.25 billion a year earlier, on net sales that rose 5.4% to £ 10.81 billion, including Indian liquor maker United Spirits Ltd. and tequila brand Don Julio, which it acquired in February.

Under Chief Executive Ivan Menezes, Diageo has said it is shifting its focus to more closely tracking what is sold to retailers rather than what is shipped to distributors. Diageo recently received an inquiry from the U.S. Securities and Exchange Commission, which is probing whether the spirits maker has been shipping excess inventory to distributors in an effort to boost results. Diageo has said it is working with the SEC on the matter.

Thursday, the company reported its shipment volume for the year was down 1% and that depletion volumes—or what is sold to retailers—is estimated to be up 1%.

Write to Saabira Chaudhuri at saabira.chaudhuri@wsj.com

Subscribe to WSJ: http://online.wsj.com?mod=djnwires