**Alphabet's Q3 2026 earnings, due after market close on October 28, will reveal YouTube advertising revenue amid continued AI-driven ad optimizations and platform competition.** Recent quarters show steady growth, with YouTube ads reaching $11.1 billion in Q2 2026 (up 13% YoY) fueled by direct-response formats, brand spending, and living-room viewing strength. Analysts project solid total company revenue around $127–131 billion, supported by search and YouTube gains from AI features like automated product identification and improved targeting. Key variables include seasonal ad demand, potential FX headwinds, advertiser caution amid economic uncertainty, and competition from TikTok and Instagram for attention and budgets. Privacy changes and any lapping effects from prior political spending could also influence results, with traders watching for signs of sustained double-digit growth or deceleration.