Employment Act (Chapter 91): Primary legislation governing employment relationships in Singapore. While consultants are typically not employees, understanding this Act is crucial for defining the boundary between consultant and employee status and for HR consulting services related to employment matters.

Personal Data Protection Act (PDPA): Governs the collection, use, and disclosure of personal data. Critical for handling employee information, establishing data protection obligations, and managing cross-border data transfer requirements in HR consulting.

Contract Law (Common Law): Fundamental principles governing contract formation, validity, terms and conditions, and remedies for breach under Singapore's common law system.

Income Tax Act: Establishes tax obligations for consultants and GST requirements where applicable to consulting services.

Competition Act: Relevant for structuring non-compete clauses and confidentiality provisions in consulting agreements.

Skills Development Levy Act: Applicable when consulting services involve training or skills development activities.

Employment of Foreign Manpower Act: Regulates the employment of foreign individuals/entities, including work pass requirements for foreign consultants.

Companies Act: Outlines corporate compliance and business registration requirements affecting consulting entities operating in Singapore.

Workplace Safety and Health Act: May be relevant depending on the scope of HR consulting services, particularly if advising on workplace safety matters.