Below are the 25 male athletes and 25 female athletes confirmed for participation in the Marathon Swimming Event of the 2016 Rio Olympic Games

MEN
USA WILIMOVSKY Jordan
NED WEERTMAN Ferry
GRE GIANNIOTIS Spyridon
USA RYAN Sean
GBR BURNELL Jack Rex David
FRA OLIVIER Marc-Antoine Daniel Frede
ITA RUFFINI Simone
CAN WEINBERGER Richard
BRA DO CARMO Allan
ITA VANELLI Federico
CHN ZU Lijun
GER REICHERT Christian
ECU ENDERICA OCHOA Ivan
RUS DRATTCEV Evgenii
TUN MELLOULI Oussama
SVK NAGY Richard
AUS POORT Jarrod
JPN HIRAI Yasunari
RSA HO Chad
BUL AYDARSKI Ventsislav
HUN PAPP Mark
VEN MALDONADO Erwin
NZL RADFORD Kane Rae Francis
KAZ KHUDYAKOV Vitaliy
EGY ELAMRAWY Marwan Ahmed Aly Morsy
WOMEN
FRA MULLER Aurelie
NED VAN ROUWENDAAL Sharon
BRA CUNHA Ana Marcela
ITA BRUNI Rachele
BRA OKIMOTO Poliana
GER HARLE Isabelle
GRE ARAOUZOU Kalliopi
USA ANDERSON Haley
HUN RISZTOV Eva
HUN OLASZ Anna
CHN XIN Xin
GBR PAYNE Keri-Anne
ECU AREVALO Samantha
AUS GUBECKA Chelsea
JPN KIDA Yumi
RSA WEBER Michelle
POL ZACHOSZCZ Joanna
VEN PEREZ Paola
SLO PERSE Spela
CZE PECHANOVA Jana
ESP VILLAECIJA Erika
CAN HORNER Stephanie
POR NEVES Vania 
MAS GAN Heidi
EGY KASEEM Reem Mohamed Hussein Elsayed