Atleten met voornaam die begint met O
Odette Helsloot, 199802764 female DWT
Okke Jansen, 200002475 male De Waalstroom
Okko de Haas, 197801593 male NTB
Ola Zalewska, 200802836 female Feijenoord Albion Zwemclub
Olaf van der Zwaard, 199802777 male Oceanus
Oliver de Haas, 198002213 male ZV De Bron
Olivia Klaver, 200802920 female Oude Veer
Olivia Schalekamp, 200203732 female Oceanus
Olivier Colombijn, 197301401 male De Krabben
Olivier Jans, 200001815 male De Fuut
Olivier Nass, 199402933 male WVZ
Olivier Wilbers, 200600181 male ZPC Hoogeveen
Ondrej Sevcik, 200702971 male VZV Njord
Onno Mens, 200004389 male Noordwijkerhout
Oriol Lloberas-Valls, 197801773 male Wave
Oscar Monge, 198102599 male IJZPC
Oscar Torres Fernandez, 199307277 male SWOL 1894
Oscar van Holsteyn, 197100373 male AquAmigos
Oscar Visser, 199102989 male ZPB H&L Productions
Otmar Lesscher, 200100795 male De Veene
Otto Jansen, 196501403 male ZVL-1886
Otto Pranger, 200000007 male Feijenoord Albion Zwemclub
Otto Zeijpveld, 195800497 male De Berkelduikers
Ottomar Brussee, 199006129 male 't Tolhekke
Ouassima Quandil, 200102948 female DWT
Oudenhoven Jeroen, 196190001 male De Dommelbaarzen
Owen Barker, 200300679 male KZC
Owen Peeks, 200100765 male ZPC Hoogeveen
Owen Riemens, 200500027 male ZPC De Zeeuwse Kust
Owen Riemens, 200500027 female ZPC De Zeeuwse Kust