<p>Math, astrophysics / astronomy, and physics all rank amongst the best in the world. Chemistry, biology, geophysical sciences, and statistics are in the top ten in the country.
On a departmental level, Chicago does not afford the same science environment as MIT, Stanford or Cal Tech, but it is a close second for UG along with Princeton, Harvard and Berkeley. If you are looking to do a PhD program in natural sciences, it will provide you with both the right course level training and big name recommendation letters necessary to enter a solid program. Also, due to the top-heavy nature of the school where graduate students outnumber undergraduates 2:1, research opportunities are copious and not at all fought for. As a result, for the motivated student, you will find a tangible distinction between Chicago and schools where science is mostly seen as pre-med or pre-engineering prep route like Brown, Dartmouth, or top LAC’s, and to a lesser extent Penn and Northwestern. </p>
<p>Computer science is quite weak though, and is mostly utilized to provide elementary programming coursework for other fields (e.g. C++ for statistics majors), despite there being some solo majors.</p>