This article is the second in this series, following “Part 1: The Legacy of Early Institutionalism: From Gypsy Fiefs to Gypsy Kings”, which covered the period from the arrival of Gypsies to Europe until the mid-nineteenth century and was published in Volume 32, Number 3 of Nationalities Papers. Part 2 describes the birth of the first modern forms of ethnically-based political and social organizations established by Romani elites from the nineteenth century up until the Second World War (WWII). The main pattern of the development of Romani representation and administration until the mid-nineteenth century—as described in Part 1—distinguished between institutionalization from within and without. In the time period described here, the pattern changes because the majority of organizations and institutions established in order to represent and administer Roma are started upon the initiative of Romani leaders. Some are, however, created under the umbrella or patronage of non-Romani authorities or organizations and their activities are controlled by these patrons; others are created in (various degrees of) cooperation with non-Romani authorities or organizations and a few are created and operate independently. In addition, during this period the first few non-Romani non-governmental organizations start to take interest in the plight of Roma, and some organizations are specifically created to address their plight and lobby “on their behalf.” The other pattern of the development that emerges in this period is the gradual ascent of the institutionalization to higher levels. While until the nineteenth century most of the Gypsies organized themselves locally and regionally (with the exception of the Polish Office of the Gypsy Kings and the Chief Voivods in Transylvania and Hungary), in this period we see the first attempts by Roma themselves to expand the institutionalization countrywide and even internationally. These patterns are again explored in the conclusion (and summarized in Table 1), while the main body deals with the various arrangements in a more or less chronological and geographical order.