Staff augmentation is a contracting and staffing approach in which an organization temporarily increases its workforce capacity by contracting for individuals with specific skills to supplement internal staff. In staff augmentation arrangements, external personnel commonly work alongside employees and may take day-to-day direction from the client organization, distinguishing the model from outsourcing arrangements in which a supplier delivers a defined service or outcome under its own management.

The term is used in multiple sectors, particularly in information technology (IT), engineering, and professional services procurement, and is sometimes contrasted with statement of work (SOW) contracting and managed services models.

Contract staffing and temporary agency work have existed in labour markets for a long time. In official statistics, related arrangements may be captured through categories such as temporary help agency workers, contract firm workers, and independent contractors, rather than through a separate "staff augmentation" classification.

In IT and project-based professional work, staff augmentation is often described as a way to obtain specialized skills or additional capacity for limited periods, particularly when organizations cannot hire quickly enough or do not require a permanent increase in headcount.

In staff augmentation, external workers are provided to supplement internal teams for a defined period or initiative. The client commonly assigns tasks and supervises work, and pricing is often time and materials (hourly or daily rates).

Common use cases include responding to short-term demand increases, addressing specialized skill gaps, supporting time-limited projects, and accelerating delivery schedules. In government IT procurement, staff augmentation contracts are frequently framed as temporary technology staffing assistance for project initiatives, with defined durations and roles such as developers, analysts, and security specialists.

Industries frequently associated with staff augmentation include information technology and software development, engineering and technical services, healthcare staffing, and business support functions. In industry reporting for the United States staffing market, IT, industrial, and healthcare staffing are commonly described as major segments of staffing revenue.

Potential benefits described in procurement and management sources include faster access to scarce skills, flexibility to scale workforce capacity up or down, and reduced long-term hiring commitment compared with permanent recruitment.