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=Negara peserta=
Seluruh 11 anggota Persatuan Pesta Olahraga Asia Tenggara direncanakan untuk ikut dalam Pesta Olahraga Asia Tenggara 2021. Berikut adalah daftar negara yang ikut serta.
{{div col|colwidth=22em}}
* {{flagSEAGF|BRU|2021}}
* {{flagSEAGF|CAM|2021}}
* {{flagSEAGF|INA|2021}}
* {{flagSEAGF|LAO|2021}}
* {{flagSEAGF|MAS|2021}}
* {{flagSEAGF|MYA|2021}}
* {{flagSEAGF|PHI|2021}}
* {{flagSEAGF|SIN|2021}}
* {{flagSEAGF|THA|2021}}
* {{flagSEAGF|TLS|2021}}
* {{flagSEAGF|VIE|2021}} '''(Tuan rumah)'''
{{div col end}}
===Cabang olahraga===
Pesta Olahraga Asia Tenggara ke-31 akan mempertandingkan 40 cabang olahraga, terutama cabang olahraga yang dipertandingkan di [[Olimpiade]].<ref>{{cite web |author1=Nguyên Phương |title=Việt Nam chỉ tổ chức tối đa 40 môn tại SEA Games 31 |url=https://thethao.sggp.org.vn/viet-nam-chi-to-chuc-toi-da-40-mon-tai-sea-games-31-670784.html |website=Sài Gòn Giải Phóng - Thể Thao Online |accessdate=4 July 2020 |language=vi |date=3 July 2020}}</ref><ref>{{cite web |author1=Lê Hùng |title=SEA Games 31 có thêm 4 môn thi đấu |url=https://thethao.sggp.org.vn/sea-games-31-co-them-4-mon-thi-dau-690751.html |website=Sài Gòn Giải Phóng Online |accessdate=12 October 2020 |language=vi}}</ref>
{{div col|colwidth=20em}}
* {{GamesSport|Anggar|Events=|Format=d}}
* {{GamesSport|Angkat Besi|Events=|Format=d}}
* {{GamesSport|Akuatik|Format=d|Events=}}
** {{GamesSport|Loncat indah|Events=|Format=d}}
** {{GamesSport|Renang|Events=|Format=d}}
** {{GamesSport|Finswimming|Events=|Format=d}}
* {{GamesSport|Atletik|Events=|Format=d}}
* {{GamesSport|Balap sepeda|Image=Yes|Events=|Format=d}}
** Sepeda gunung
** Sepeda jalanan raya
* {{GamesSport|Biliar|Events=|Format=d}}
* {{GamesSport|Binaraga|Events=|Format=d}}
* {{GamesSport|Bola Basket|Format=d|Events=|Image=No}}
**[[File:Basketball pictogram.svg|17px]] Bola Basket 5x5
**[[File:3x3 basketball pictogram.svg|17px]] Bola Basket 3x3
* {{GamesSport|Bola tangan|Events=|Format=d}}
* {{GamesSport|Bola voli|Format=|Events=|Image=No}}
** [[Berkas:Volleyball pictogram.svg|17px]] Ruangan
** [[Berkas:Volleyball (beach) pictogram.svg|17px]] Pantai
* {{GamesSport|Boling|Events=|Format=d}}
* {{GamesSport|Bulutangkis|Events=|Format=d}}
* {{GamesSport|Catur|Events=|Format=d}}
* {{GamesSport|Dansa|Events=|Format=d}}
* {{GamesSport|Dayung|Events=|Format=d}}
* {{GamesSport|Esports|Events=|Format=d}}
* {{GamesSport|Futsal|Events=|Format=d}}
* {{GamesSport|Golf|Events=|Format=d}}
* {{GamesSport|Gulat|Events=|Format=d}}
* {{GamesSport|Judo|Events=|Format=d}}
* {{GamesSport|Jujutsu|Events=|Format=d}}
* {{GamesSport|Kano|Events=|Format=d}}
* {{GamesSport|Karate|Events=|Format=d}}
* {{GamesSport|Kickboxing|Events=|Format=d}}
* {{GamesSport|Kurash|Events=|Format=d}}
* {{GamesSport|Menembak|Events=|Format=d}}
* {{GamesSport|Muaythai|Events=|Format=d}}
* {{GamesSport|Panahan|Events=|Format=d}}
* {{GamesSport|Pencak silat|Events=|Format=d}}
* {{GamesSport|Pétanque|Events=|Format=d}}
* {{GamesSport|Senam|Events=|Format=d}}
**Artistik
**Ritmik
**Aerobic
* {{GamesSport|Sepak bola|Events=|Format=d}}
** {{GamesSport|Sepak Bola Pantai|Events=|Format=d}}
** {{GamesSport|Sepak Bola|Events=|Format=d}}
* {{GamesSport|Sepak takraw|Events=|Format=d}}
* {{GamesSport|Taekwondo|Events=|Format=d}}
* {{GamesSport|Tenis|Events=|Format=d}}
* {{GamesSport|Tenis Meja|Events=|Format=d}}
* {{GamesSport|Tinju|Events=|Format=d}}
* {{GamesSport|Trilomba|Events=|Format=d}}
* {{GamesSport|Vovinam|Events=|Format=d}}
* {{GamesSport|Wushu|Events=|Format=d}}
{{div col end}}
= Peringkat Medali =
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