The 2019–20 season is Happy Valley's 50th season in the top-tier division in Hong Kong football.

Happy Valley will compete in the Premier League, Senior Challenge Shield, FA Cup and Sapling Cup this season.

Note: Flags indicate national team as defined under FIFA eligibility rules; some limited exceptions apply.

Players may hold more than one non-FIFA nationality.

Remarks: LP These players are registered as local players in Hong Kong domestic football competitions.