This study was an inter-office communications analysis in the University of Eastern Philippines-Main Campus and its inputs to strengthening administrative communication. The study used the descriptive-analytical and evaluative research design. Specifically, it tried to find out the content of communications sent to selected offices in UEP-Main Campus, as regards to nature, direction of communication, form, and purpose; analyze office communications in terms of clarity, conciseness, accuracy, organization, and mechanics; find out if there are significant differences in the inter-office communications among colleges and selected offices; and draw inputs to public administration. The study involved 11 offices of the University – the University Management Center headed by the Office of the President, the Graduate School and nine (9) colleges of the University with the Offices of the Deans of all the nine (9) colleges and school. This study considered only the offices which issued Special Orders, Memoranda, and letters sent to different offices in the University. The data of the inter-office communications which pertained to the objectives of the study were tabulated, analyzed, and evaluated for the purpose of arriving at desired results. It made use of the frequency counts, percentages, mean, and ANOVA. Results of the study showed that by nature, memoranda, special orders and letters are common and inherent in offices as an interpersonal exchange of information and understanding. The GS, CL, and CN were very concise in their SOs. The College of Law wrote special orders that were very accurate. The colleges which got the highest mean of 5.0 in organization had very well-organized special orders. This indicates that the Office of the President and the College of Education had no errors in punctuation or spelling and used the technical style of writing and rules that govern the composition of S.O. The Graduate School and the College of Education wrote memoranda which were very much clear while the College of Agriculture had only much clear memoranda. The CBA stood out as having as having written very much concise memoranda while the CN, CE, and CA were only very much concise. This indicates that memoranda written by this college was very much accurate; the CVM wrote memoranda which were just averagely accurate. Those offices wrote very much organized memoranda but the COED and OP topped them all. This indicates that these two colleges observed very much the mechanics of writing memoranda while CL and CN just observed moderately the mechanics. This meant that they wrote letters that were very much clear. Colleges with lower rates mean they wrote letters that were only much clear. It indicates that the GS and the CL wrote very much concise letters while the CAC only much concise. The OP wrote very much accurate letters while the CAC wrote letters which were averagely accurate. Having a highest grand mean means that those offices had very much organized letters. The OP and the CE observed very much the mechanics of writing letters. Considering the important role played by written communication in the administration of public offices, programs, and projects or activities, specifically in planning, deciding, directing, and controlling, all of these issues are put in written form. But when they are not made clear, they can cause confusions, misconceptions, disunity and dissatisfaction.