The seventeenth episode of Season 16, and the three hundred and eighty-third episode of America's Got Talent overall, was aired on September 7, 2021. It was the second of two Semifinals performance episodes and took place at the Dolby Theatre. 11 acts performed for 5 spots in the Finals.
|1. 1aChord||Vocal Trio|
|2. UniCircle Flow||Unicycle Group|
|3. Léa Kyle||Quick-Change Artist|
|4. Kabir Singh||Stand-Up Comedian|
|5. Northwell Health Nurse Choir||Choir|
|6. Peter Antoniou||Mentalist|
|7. Victory Brinker||Opera Singer|
|8. Chapkidz||Dance Group|
|9. Rialcris||Acrobatic Trio|
|10. Josh Blue||Stand-Up Comedian|
|11. Brooke Simpson||Singer|
This episode has the most amount of buzzes in a semifinal episode since Episode 627.
This episode has the most amount of acts buzzed in a live show since Episode 722.
This episode currently holds the most amount of acts buzzed by Simon Cowell in a live show episode with 3.