Addressing a summit of donor nations in London, Kerry said that USD 600 million in new funding would go on urgent aid to refugees and beleaguered populations in and around Syria.
Another USD 290 million will go on development assistance for schooling for refugee children in Jordan and Lebanon.
The figure covers the current US fiscal year, which runs until August, and is in addition to previous contributions.
"The United States has provided over USD 4.5 billion to help Syrian refugees and those displaced within Syria, and I'm proud that that makes us the largest single external donor in the world," Kerry said.
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"By helping refugees, we remind ourselves of who we are, what we are against, and what we are for," he said.
In September, Kerry said, US President Barack Obama will convene a summit on refugees on the sidelines of the United Nations General Assembly.
"Between then and now, we call on the global community to increase by at least thirty percent the overall response to humanitarian funding appeals for refugees," he said.