U.S. Ethics Rules:
Model Rules of Professional Conduct (2002, as amended 2007)
States and D.C.:
  ABA link
  Cornell LII link
  Cornell Law Library Ethics Links
  U.S. Territories:
    American Samoa
    Guam
    Northern Mariana Islands (adopting MRPC)
    Puerto Rico (in Spanish; in English on Westlaw)
    U.S. Virgin Islands
ABA Model Rules for Lawyer Disciplinary Enforcement
ABA Model Federal Rules of Disciplinary Enforcement

U.S. Attorneys
  U.S. Attorneys' Manual:
    Title 9 & Title 1
    28 U.S.C. § 530B (ethics for government attorneys)
    28 C.F.R. § 77.1 et seq. (ethics for government attorneys)
    Government Ethics Outline (DoJ Justice Management Division)

Military Courts
  Court of Appeals of the Armed Forces
  Air Force
  Army
  Navy and Marines, 32 C.F.R. Part 776, specifically §§ 776.18-776.71 and JAG Instruction 5803.1B

Canadian Law Society Rules
  Alberta
  British Columbia
  Manitoba
  New Brunswick
  Newfoundland
  Northwest Territories
  Nova Scotia
  Nunavit
  Ontario
  Prince Edward Island
  Saskatchewan
  Quebec
  Canadian Military Courts (counsel follow the CBA rules, their local law society rules, and the Canadian Forces Code of Ethics)
  Yukon
  Canadian Law Societies
  Canadian Bar Association

International Tribunals
  International Criminal Bar (Organisation—>Official documents—>ICB Code of Conduct and Disciplinary procedure (.pdf & Word); not yet adopted)
  International Criminal Court (not yet adopted)
  International Criminal Tribunal for Rwanda
  International Criminal Tribunal for the Former Yugoslavia
  Special Court for Sierra Leone (Documents; not yet adopted)
  War Crimes Research Portal
  International Criminal Defence Attorneys Association (Defence Watch)
  International Association of Prosecutors (Documentation—>Standards of professional responsibility and statement of the essential duties and rights of prosecutors (English) & "Norma" (Spanish))

Other Ethics Sources
  Cornell Law Library Ethics Links
  LegalEthics.com
  ABA Center for Professional Responsibility
  ABA EthicsSEARCH
  ABA Bookstore
  Lawyers for the Profession, Hinshaw & Culbertson (click on "Alerts")
  IRS Form 8300 (English)
  IRS From 8300 (Spanish)
  26 U.S.C. § 6050I
  FinCEN website