Google’s workforce continues to look pretty much the same as previous years, according to its annual diversity report published Thursday, a sign of the task awaiting its newly named head of diversity.

Google said Thursday that women made up 31% of its employees last year, the same percentage as the previous year’s report. It barely moved the needle on other fronts: the percentage of black employees was unchanged at 2%, and the number of Hispanic workers increased by 1 percentage point, to 4%. The majority of Google workers...