Google Services revenues were $59.9 billion, up 41 per cent, and Google Search and other advertising revenues of $37.9 million in the quarter were up 44 per cent.
The company said in a statement late on Tuesday that YouTube advertising revenues of $7.2 billion were up 43 per cent due to strength in both direct response and brand advertising.
"Our long-term investments in AI and Google Cloud are helping us drive significant improvements in everyone's digital experience," said Sundar Pichai, CEO of Alphabet and Google.
"Search remains the heart of what we do. We have made remarkable advances over the past 23 years that benefits Search and related products like Google Assistant, which just celebrated five years," he added.
For Google Cloud, the revenues were $5 billion for the third quarter, up 45 per cent.
"Google Cloud Platform's (GCP) revenue growth was again above cloud overall, reflecting significant growth in both infrastructure and platform services," said Ruth Porat, Senior Vice President and Chief Financial Officer.
At the Alphabet level, headcount grew by nearly 6,000 in the third quarter, including seasonal campus hires.
"We expect robust headcount growth in Q4 for both Google Services and Google Cloud," the company said.
Alphabet said that with respect to foreign exchange impact on reported revenues, it expects virtually no impact in Q4 in contrast to a 1.5 per cent tailwind in Q3 and 4 per cent in its Q2.