When considering which Oxford college is the most prestigious for Mathematics, it’s important to recognize that “prestige” can be subjective and may depend on various factors such as faculty, research output, and historical significance. However, a few colleges are particularly renowned for their Mathematics programs.

1. Magdalen College: Often cited as one of the top choices, Magdalen has a strong reputation for its Mathematics faculty and a vibrant academic community. The college has produced numerous prominent mathematicians and offers excellent resources for students.

2. Christ Church: Known for its rich history and beautiful architecture, Christ Church is another prestigious college. It has a significant number of successful Mathematics alumni and provides a supportive environment for students.

3. St. John’s College: St. John’s is recognized for its academic excellence and offers a strong Mathematics program. The college emphasizes a collaborative atmosphere, which can enhance your learning experience.

4. Balliol College: With a long-standing tradition of academic rigor, Balliol also has a reputation for strong support in Mathematics. The college encourages intellectual exploration and has many successful graduates in the field.

5. Keble College: Although slightly less famous than the others, Keble has a solid Mathematics department and is known for its modern facilities and supportive community.

Ultimately, while these colleges are prestigious, the best fit for you may depend on other factors such as the college culture, community, and available resources. It’s advisable to visit the colleges if possible, speak to current students, and consider where you feel most comfortable. Remember, the quality of teaching and support you receive will play a significant role in your success, irrespective of the college’s prestige.