HLSS can refer to:

• Half-Life Sound Selector, a program that allows users to play audio files using voice communication on games developed by Valve Corporation.
• Heart Lake Secondary School, a high school in Brampton, Ontario, Canada
• Hopscotch Lollipop Sunday Surprise, a 2001 album by The Frogs
• School of Humanities, Languages and Social Sciences (UWE), Bristol

• 1994 Stella Artois Championships – Doubles
• 1994 Stella Artois Championships – Singles
• 1994 Stockholm municipal election
• 1994 Stockholm Open
• 1994 Stockholm Open - Singles
• 1994 Stockholm Open – Singles
• 1994 Strathclyde water referendum
• 1994 Stuttgart Indoor
• 1994 Suisse Open Gstaad
• 1994 Sun Bowl
• 1994 Superbike World Championship
• 1994 Superbowl
• 1994 Supercopa de Espana
• 1994 Supercopa de España
• 1994 Supercopa Libertadores
• 1994 Supercoppa Italiana
• 1994 Super Tourenwagen Cup
• 1994 Surat plague scare
• 1994 Swedish football Division 1
• 1994 Swedish football Division 2
• 1994 Swedish Open
• 1994 Swiss Indoors
• 1994 Swiss Open
• 1994 Swiss Open Gstaad
• 1994 Sybase Open