The largest source of scholarships for Jewish students is through Hillel: The Foundation for Jewish Campus Life. This organization maintains an extensive online database of national and state scholarships specifically tailored for Jewish applicants. National institutions listed include B'nai Brith, Hadassah, Jewish War Veterans of America, the Hebrew Immigrant Aid Society and others.
The Jewish Federations of North America maintains a network of offices in most large and mid-sized cities in the United States and Canada. Local Federation branches often can provide information on private scholarship funds for Jewish students, and may have scholarships available that are not advertised widely.
University financial aid offices maintain a list of scholarships, usually smaller ones, that are specific to that institution alone. This information may be available only through direct inquiries, as schools might not post all available awards online.
Finally, contact the rabbis of synagogues and temples in your area. Local congregations may offer small financial awards, and rabbis sometimes maintain discretionary funds that they may disburse as scholarships.