Football referees

Oscar Tsotetsi

Oskari Tuomi

Özguç Türkalp

Olim Tuychibaev

Oleksandr Tytov

O. Uğurlu

Ozgün Ustaoglu

Oliver Väät

Ognjen Valjić

Oscar van Hoof

Odanel Velez

Oliver Amet Vergara Rodriguez

Özgür Yankaya

Oliver Yates

Onur Yayar

Olcay Yıldırım

Olsion Yzeiraj

Olga Zadinova

Ri-Hyang Ok

Oliver Romić

Omar Abdulkadir Artan

Óscar Martínez Santos

Oscar Mejia Garcia

Óscar Sauleda Torrent

Promise Adebayo-Ige

Pedro Afonso

Paul Jasper Albrecht

Priit Alekask

Pousri Armi Alfred

Paulo César Almeida Raposo

Patrick Alt

Pedro Alves de Oliveira

Paulo Roberto Alves Júnior

Peter Antal

Petr Ardeleanu

Pol Arenas Mora

Pedro Argañaraz

Pierre Ghislain Atcho

Pranjal Banerji

Peter Bankes

P. Bär

Paulo Belence Alves dos Prazeres Filho

Péter Bence Belicza

Peter Bernardy

Patricio Blanca Fuentes

Paula Brady

Pavel Breivik

Pablo Camacho

Paola Cebollada López

Prajwol Chhetri