- Oaths Regulation 2011
- Occupational Health and Safety (Clothing Factory Registration) Regulation 2001
- Occupational Health and Safety Legislation (Short Descriptions of Offences) Regulation 1996
- Occupational Health and Safety Regulation 2001
- Occupational Health and Safety (Savings and Transitional) Regulation 2001
- Occupational Licensing National Law (Transitional) Regulation 2011
- Offshore Minerals Regulation 2000
- Offshore Minerals Regulation 2006
- Offshore Minerals Regulation 2013
- Ombudsman Regulation 1999
- Ombudsman Regulation 2005
- Ombudsman Regulation 2011
- Optical Dispensers Regulation 1997
- Optical Dispensers Regulation 2002
- Optical Dispensers Regulation 2007
- Optometrists Regulation 1995
- Optometrists Regulation 2004
- Optometrists Transitional Regulation 2003
- Osteopaths Regulation 2002
- Osteopaths Regulation 2007
- Osteopaths Transitional Regulation 2002
- Ozone Protection Regulation 1997