This special issue of Australian Health Review features original research articles, reviews and perspectives dedicated to the theme strengthening the allied health workforce. Of the total health workforce, more than 126 000 are registered allied health practitioners in Australia. 1 With the growing demands upon the health system from patients with complex and chronic conditions, there is a resurgence of interest in strengthening the allied health workforce. At the 2014 Victorian Allied Health Research Conference, the allied health workforce was viewed as the glue in the health system with the potential to ease the pressure off the health system and to create system-level resiliency. 2 It is timely to reflect upon the allied health workforce, as over a decade ago a comprehensive review was conducted of the allied health workforce by the Australian Health Ministers' Advisory Council (AHMAC) to inform national-level workforce planning. 3 The 2004 AHMAC review highlighted multiple key issues facing the allied health workforce, and multiple key actions areas under four key domains: workforce roles; data collection; education and training; and national structures. Later in this editorial I briefly reflect upon the substantial allied health workforce developments that have occurred since the 2004 AHMAC review.In this special issue of Australian Health Review we publish a series of papers that aim to contribute to the evidence base to inform decision-making regarding allied health workforce policy, practices and research.We start with two perspectives. Philip 4 emphasises the unrealised potential of how allied health can address the many challenges facing the health system. Markham 5 then highlights that the time has come to recognise that allied health leaders and clinicians can have an active role in leading health care reform.Over the last decade, many national-and state-level, policyfocussed consultations and reviews of the allied health workforce have been conducted. Nancarrow et al. 6 report on the findings of the Queensland Health Ministerial Taskforce review of the expansion of scope of practice of allied health roles. Skinner et al. 7 then canvases key issues (regulatory, educational, evidence) that need attention and development to optimise allied health work in specialised advanced and extended roles. Pearce and Pagett 8 provides a case study of the emerging role of allied health assistants in the Australian Capital Territory. With the recognition that allied health assistants need to be working to their full scope of practice, Somerville et al. 9 present a model to assist services to identify tasks suitable for delegation to an allied health assistant by an allied health professional.Patient-centred care is a widely recognised underlying principle of all models of service delivery in health care. Harding et al. 10 describe the findings of a qualitative study of patient's experience and perception of being seen by an expandedscope-of-practice physiotherapist, specifically a musculoskeletal physiotherapist. Ha...