Serbuk sari atau pollen (bahasa Inggris) merupakan alat penyebaran dan perbanyakan generatif dari tumbuhan berbunga. Serbuk sari merupakan modifikasi dari sel sperma. Secara sitologi, serbuk sari merupakan sel dengan tiga nukleus, yang masing-masing dinamakan inti vegetatif, inti generatif I, dan inti generatif II. Sel dalam serbuk sari dilindungi oleh dua lapisan (disebut intine untuk yang di dalam dan exine yang di bagian luar) untuk mencegahnya mengalami dehidrasi.
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