Yes, although awards generally are few in number and of only limited amounts. Check each sponsor for eligibility rules, application periods and other details.
American Foreign Service Association Merit Awards and Financial Aid Scholarship, for dependents of Foreign Service employees, http://www.afsa.org – select “For Students”
American Postal Workers Union, scholarships open to high school students, http://www.apwu.org/dept/sec-treas/stscholarships.htm
Federal Employee Education & Assistance Fund, need-based awards, http://www.feea.org/scholarships
Federally Employed Women, scholarships available for members and their children, www.few.org/training-education/scholarship-applications
National Association of Letter Carriers, scholarships available for members and their children, http://www.nalc.org/nalc/members/scholarships.html
In addition, a federal program, the Federal Cyber Service–Scholarship For Service, provides annual stipends for students preparing for careers in information security, https://www.sfs.opm.gov.