The seventeenth episode of Season 13, and the three hundred and fourth episode of America's Got Talent overall, aired on September 5, 2017. It was the first of two Semifinals performance episodes and took place in the Dolby Theatre. 11 acts performed for 5 spots in the Finals.
|1. Amanda Mena||Singer|
|2. Junior New System||Dance Group|
|3. Us the Duo||Band|
|4. Voices of Hope Children's Choir||Choir|
|5. Shin Lim||Magician|
|6. Makayla Phillips||Singer|
|7. Front Pictures||Multimedia Performance Act|
|8. Duo Transcend||Trapeze Duo|
|9. Samuel J. Comroe||Stand-up Comedian|
|10. Michael Ketterer||Singer|
|11. Zurcaroh||Acrobatic Group|
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