The Association of Research Libraries (ARL) Annual Salary Survey 2003-04 reports salary data for all professional staff working in Association of Research Libraries (ARL) libraries. It is the most comprehensive and thorough guide to current salaries in large U.S. and Canadian academic and research libraries, and is a valuable management and research tool. Data for 9,492 professional staff members were reported this year for the 114 ARL university libraries, including their law and medical libraries (907 staff members reported by 73 medical libraries and 744 staff members reported by 75 law libraries). For the 10 non university ARL members, data were reported for 3,877 professional staff members. The tables are organized in seven major sections. The first section includes Tables 1 through 4, which report salary figures for all professionals working in ARL member libraries, including law and medical library data. The second section includes salary information for the 10 non university research libraries of ARL. The third section, entitled "ARL University Libraries," reports data in Tables 7 through 25 for the "general" library system of the university ARL members, combining U.S. and Canadian data but excluding law and medical data. The fourth section, composed of Tables 26 through 30, reports data on U.S. ARL university library members excluding law and medical data; the fifth section, Tables 31-34, reports data on Canadian ARL university libraries excluding law and medical data. The sixth section (Tables 35-41) and the seventh section (Tables 42-48) report on medical and law libraries, respectively, combining U.S. and Canadian data. The following are appended: (1) ARL Member Libraries; and (2) Table Numbering Changes for 1998-99 to 1999-2000. (Contains 4 figures, 48 tables, and 93 footnotes.)