The Global Teacher Shortage: Why Classrooms Are Running Short of Staff

What happened?

Education ministries and international agencies are again drawing attention in 2026 to a persistent and, in many regions, worsening shortage of qualified teachers. UNESCO's teacher workforce monitoring has long flagged the gap between the number of teachers countries need to meet basic education targets and the number they are actually able to recruit and retain, and recent reporting suggests the gap remains wide, particularly in primary and lower-secondary education across low- and middle-income countries. The shortage is not confined to poorer nations; several high-income countries have reported difficulty filling posts in mathematics, science and special education, along with high attrition among early-career teachers.

The result is larger class sizes, greater reliance on underqualified or temporary staff, and, in the most affected areas, schools that struggle to offer a full curriculum. Education officials describe a workforce pipeline problem that combines too few people entering teacher training, too many leaving the profession within their first five years, and pay and working conditions that have not kept pace with other graduate career paths.

Key points

• UNESCO estimates that many countries need to recruit large numbers of additional teachers to reach universal basic education goals, with the gap concentrated in Sub-Saharan Africa and South Asia.
• Teacher attrition in the early years of a career is a major driver of shortages in higher-income countries, not just insufficient recruitment.
• Shortages are most acute in specific subjects, including mathematics, science and special educational needs provision.
• Rural and remote schools face disproportionate difficulty attracting and retaining staff compared with urban schools.
• Pay, workload and classroom conditions consistently rank among the top reasons teachers cite for leaving the profession.

What we know

International education data compiled by UNESCO's Institute for Statistics tracks pupil-teacher ratios and projected teacher demand across regions, and this data has consistently shown that many low-income countries would need to substantially expand their teaching workforce to meet class-size and coverage targets set out in global education goals. In some of the most affected countries, a significant share of classrooms are led by teachers without the minimum required qualifications, a gap that education researchers link to weaker learning outcomes, particularly in foundational literacy and numeracy.

In wealthier education systems, the nature of the shortage looks different: overall teacher numbers may be closer to target, but specific subjects and specific types of schools, particularly those serving disadvantaged communities, struggle persistently to fill vacancies. National teaching workforce surveys in several OECD countries have documented rising numbers of teachers reporting intentions to leave the profession within the next several years, often citing workload and stress alongside pay.

Officials and experts

UNESCO has repeatedly called on governments to treat teacher recruitment and retention as a central pillar of education policy rather than an administrative afterthought, arguing that no curriculum reform or infrastructure investment can compensate for classrooms without enough qualified staff. The organisation's teacher task force has pushed for improved pay structures, stronger initial training pathways and better working conditions as the core levers available to policymakers.

The OECD's education directorate has highlighted the importance of career-long professional development and mentoring for early-career teachers as a way to reduce attrition, noting that many teachers who leave within their first years describe feeling unsupported rather than simply overworked. Teacher unions and professional associations in multiple countries have used the shortage as leverage in pay negotiations, arguing that competitive salaries relative to other graduate professions are essential to reversing recruitment declines.

Background

Concerns about teacher supply are not new; international agencies have tracked workforce gaps for over a decade as part of efforts to expand access to basic education globally. What has changed is the scale of demographic pressure in some regions, where growing school-age populations in parts of Africa and South Asia mean that even stable teacher training output translates into a widening gap relative to need. At the same time, ageing teacher workforces in parts of Europe and East Asia mean a wave of retirements is approaching just as fewer graduates choose teaching as a career.

The COVID-19 pandemic added further strain, with extended school closures, remote teaching demands and pandemic-era burnout contributing to elevated attrition in several countries. Education systems that entered the pandemic already short-staffed found the disruption compounded existing vulnerabilities rather than creating entirely new ones.

Detailed analysis

The teacher shortage is best understood as a pipeline problem with multiple leak points rather than a single cause. At the entry point, teaching competes with other graduate careers for talent, and in many countries starting salaries for teachers have not kept pace with comparable professions requiring similar levels of education, making the profession relatively less attractive to new graduates. Where teacher training programmes exist, completion rates and subsequent entry into the profession are not guaranteed; some trainees complete certification but choose not to teach, or leave shortly after starting due to unmet expectations about workload and support.

Retention is arguably the more urgent lever for policymakers to pull because it offers faster returns than expanding training pipelines, which can take years to produce qualified graduates. Evidence from several national teacher surveys suggests that structured mentoring programmes, manageable class sizes and clearer career progression pathways can meaningfully reduce early-career attrition, even without dramatic pay increases, though pay remains an important baseline factor. Countries that have successfully stabilised their teaching workforce in recent years tend to have combined several of these measures rather than relying on any single fix.

Geographic and subject-specific shortages compound the aggregate numbers problem. Even in countries where the national teacher count appears roughly adequate, rural, remote and high-poverty urban schools often cannot attract enough applicants, leading to reliance on long-term substitute staff or unfilled posts. Subjects requiring specialised technical knowledge, particularly mathematics, physics and computer science, face additional competition from private-sector employers who can offer substantially higher salaries, making these shortages structurally harder to resolve through education policy alone.

The consequences for students are well documented in education research: larger class sizes and less qualified or less experienced teachers are associated with weaker learning outcomes, particularly for students who are already disadvantaged and have fewer resources to compensate outside school. This creates a feedback loop in which the schools facing the most severe staffing shortages are often also serving the students most in need of stable, experienced teaching, widening rather than narrowing educational inequality.

Technology is sometimes proposed as a partial solution, whether through remote teaching arrangements for shortage subjects or AI-assisted tools that reduce administrative burden on existing staff. Education researchers are generally cautious about overstating what technology can achieve, noting that it can support but not substitute for a stable, well-trained teaching workforce, particularly in the early years of schooling where relationships and in-person support matter most.

Why it matters

Teacher shortages translate directly into classroom conditions that affect learning outcomes for millions of students, with the heaviest costs typically falling on children in already disadvantaged communities. Persistent understaffing also has long-term economic implications, since a country's future workforce depends heavily on the quality of foundational education its citizens receive.

For families, the shortage can mean larger classes, more frequent staff turnover disrupting continuity, and in some cases entire subjects taught by underqualified staff or left uncovered. For education systems more broadly, the shortage represents a structural vulnerability that undermines other reform efforts, since curriculum changes, new assessment methods or additional funding cannot deliver full benefits without enough qualified teachers in classrooms to implement them.

What happens next?

Governments in several regions have announced or expanded teacher recruitment incentives, including signing bonuses, loan forgiveness schemes and rural placement allowances, though the scale of these measures varies considerably and their long-term effectiveness is still being evaluated. International agencies are expected to continue pressing for increased domestic education spending and international support for teacher training in the lowest-income countries as part of broader efforts to meet global education goals.

Analysts expect the shortage to remain a defining education policy challenge over the coming years, with the pace of improvement depending heavily on whether governments treat teacher retention as seriously as recruitment, and whether pay and working conditions are allowed to keep pace with competing career options.