This book constitutes the refereed post-workshopproceedings of the Second International Workshop on Worldwide Language Service Infrastructure, WLSI 2015, held in Kyoto, Japan, in January 2015.The 4 full papers included in this volume and presentedtogether with 2 short papers and 8 invited papers, were carefully reviewed andselected from 7 submissions. The papers are categorized into four parts:introducing metadata and annotations; providing technologies for languageservice platforms; atomic language services across different interfaces, policies, and development of language resources and services; and collectingreports on language service application.