It is an honor and a pleasure to present the proceedings of the 24th European Conference on Object-Oriented Programming (ECOOP 2010) held in Maribor, Slovenia. As always, the conference catered to a broad audience of members of industry and academia and consequently o?ered a mix of results in both applied andtheoreticalresearchinobjectorientation. Inall,24technicalpapers,12wo- shops,6tutorials,adoctoralsymposiumandaspecialsessiononempiricalme- ods were organized. Additionally, a seriesof seven summer school sessionsran in parallel with the technical paper sessions. A junior and a senior Dahl-Nygaard award were selected by AITO leading to two keynote talks, complemented by an invited keynote on the subject of empirical methods as applied to software practice. The banquet speech was given by Oscar Nierstrasz. The ECOOP P- gram Committee also selected a best paper award. These proceedings consist of 24 papers and one extended abstract selected from 108 submissions. Each paper received3 and as many as 6 reviewsfrom a ProgramCommittee consisting of 30 internationally reputed researchers. A long and intensive virtual discussion via CyberChairPROled to an author response period and to another week of online deliberation. This wasroundedo?by a ProgramCommittee meeting late Feb- aryinBrussels. Itwasagainshownthatnothingmatchesaphysicalmeeting,and that it in several instances is even indispensable, in spite of the huge e?ort that is required to organize it. The Program Committee discussions followed Oscar Nierstrasz' Champion pattern: for a paper to be accepted at least one manifest proponent is required. Program Committee members were allowed to submit a paper, but these were subjected to a higher level of scrutiny.