Revenue in the third quarter rose to $22.5bn (£18.5bn), from $18.7bn a year earlier.
Net income for the quarter was $5bn, up from $4bn a year ago.
Alphabet, along with Facebook, dominates the fast-growing mobile advertising market.
Google's total ad revenue rose 18.1% to $19.82bn in the third quarter, accounting for more of its revenues.
"We had a great third quarter," Alphabet chief financial officer Ruth Porat said in the earnings release.