Is University of Illinois Urbana-Champaign or Purdue more selective for undergraduate admissions?

The biggest practical tradeoff is that both UIUC and Purdue are selective in very similar ways, but UIUC is often tougher to get into for certain high-demand majors while Purdue can feel a bit more accessible overall at the university level. Neither is a safety for popular programs like engineering or computer science, and at both schools, the specific major you apply to matters a lot. For a simple college-list takeaway, UIUC is usually viewed as slightly more selective overall, especially in its most sought-after programs.

That said, the difference is not huge enough to treat them as totally different tiers of difficulty. Purdue is also very competitive, particularly for engineering, business, and other direct-admit areas. In practice, a student might be admitted to one and denied from the other because each school evaluates applicants in somewhat different ways and because capacity by major can shift year to year.

UIUC is especially known for having very competitive admission in engineering, computer science, and some business pathways. Purdue is also highly respected in those areas, but the broad perception among applicants is that UIUC can be the harder admit when you look at the most in-demand programs.

So if your question is simply which school is more selective for undergraduate admissions, UIUC gets the edge by a small margin overall. If you are comparing a specific major, especially engineering or CS, it is best to assume both are highly selective and that the major-level admit difficulty matters more than the school-wide label.