The British undergraduate degree classification system is a grading structure used for undergraduate degrees or bachelor's degrees and integrated master's degrees in the United Kingdom. The system has been applied, sometimes with significant variation, in other countries and regions.

The UK's university degree classification system, established in 1918, serves to recognize academic achievement beyond examination performance. Bachelor's degrees in the UK can either be honours or ordinary degrees, with honours degrees classified into First Class, Upper Second Class (2:1), Lower Second Class (2:2), and Third Class based on weighted averages of marks. The specific thresholds for these classifications can vary by institution. Integrated master's degrees follow a similar classification, and there is some room for discretion in awarding final classifications based on a student's overall performance and work quality.

The honours degree system has been subject to scrutiny owing to significant shifts in the distribution of classifications, leading to calls for reform. Concerns over grade inflation have been observed. The Higher Education Statistics Agency has documented changes, noting an increase in the proportion of First Class and Upper Second Class honours degrees awarded; the percentage of First Class Honours increased from 7% in 1997 to 26% in 2017. Critics argue this trend, driven partly by institutional pressures to maintain high league table rankings, dilutes the value of higher education and undermines public confidence. Despite improvements in teaching and student motivation contributing to higher grades, there is a sentiment that achieving a First or Upper Second Class Honours is no longer sufficient for securing desirable employment, pushing students towards extracurricular activities to enhance their resumes. The system affects progression to postgraduate education, with most courses requiring at least a 2:1, although work experience and additional qualifications can sometimes compensate for lower classifications.

In comparison to international grading systems, the UK's classifications have equivalents in various countries, adapting to different academic cultures and grading scales. The ongoing debate over grade inflation and its implications for the UK's higher education landscape reflect broader concerns about maintaining academic standards and the value of university degrees in an increasingly competitive job market.