Diploma programme developing English language proficiency, offered by the Faculty of Management, Humanities & Social Sciences.

External diploma in English offered through the university's external studies stream, with progression to the Higher Diploma in English.

Diploma in English offered by the Department of Language Studies, Faculty of Humanities and Social Sciences.

One-year external diploma (SLQF Level 03) run by UPEDEC with in-person classes on Sundays, 8.30 a.m.-3.30 p.m., covering grammar, writing, speaking and communication skills.

Diploma offered by the Department of English fostering language skills and appreciation of literature, with case-based teaching and a structured curricular framework. Also offered at the Hanwella branch.

One-year part-time diploma improving English competence and soft skills for employment, higher education and professional advancement, taught in 6-hour Sunday sessions with module-end written and oral evaluations.

Professional diploma offered by the Department of Professional Studies in Agriculture for students and professionals in agro-business and agriculture.

Diploma in food science offered by the Department of Chemistry, Faculty of Natural Sciences.

Professional diploma offered by the Department of Professional Studies in Agriculture.

A 3-year, 9-term nursing diploma combining theory with about 50% clinical placement in hospital and community settings, training competent general nurses with leadership and research exposure.

One-year diploma in heritage and cultural tourism offered by the SLIIT School of Architecture.

Diploma offered by the Department of Hospitality Management, which runs courses in international cookery, culinary art and hotel management with an internationally mapped curriculum.

12-month full-time diploma covering hotel operations and customer service, Pearson Assured (UK) and TVEC approved.

12-month (450-hour) diploma in HRM theory and practice, including recruitment, training, performance appraisal, motivation and the legal sources and regulations relevant to HR. Held on Sundays at the campus.

Weekend diploma offered by the Department of Business Management.

Diploma offered by the Department of Information and Communication Technology, structured to align with national and international qualification frameworks; offered in weekday and weekend modes.

One-year weekend diploma giving comprehensive knowledge of insurance fields plus English and ICT, run by the Department of Insurance and Risk Management at Colombo, Galle, Kegalle and Kurunegala centres.

Diploma offered by the Department of Hospitality Management covering international cookery and culinary art.

Professional diploma in animal husbandry offered by the Department of Professional Studies in Agriculture.