Women in Sage Days 2 : Number Theory
- Location: Seattle, Washington
- Dates: August 22, 2011 to August 26, 2011
- Organizers: Alyson Deines (UW), Jennifer Balakrishnan (MIT), Gagan Sekhon (California), William Stein (UW)
- Funding: Microsoft Research (donation from Kristin Lauter's cryptography group)