This thesis is a comprehensive approach about the circulation of Roma families in the region of Poitou-Charentes in France and in Belgium. Whereas the stays of the Roma population is governed by a specific law in France, the reception is not organized in Belgium and remains irregular. In France, faced with this often repressive legal framework, families are trying to sustain their circulation practices. This circulation, dubbed a "circulatory project", is analysed by using individual and group interviews, direct observations and a five-year immersion period within a group of gypsies in Charente-Maritime (France). In this way is highlights the relationship between identity, space and mobility. This research analyses the consequences of public policies on the "circulatory projects" of families. Therefore, this research is integrated in a comparative work of spatial practices in a legislated space and non-legislated space to highlight the circulatory behaviours developed by the Roma population. The processing of data from fieldwork makes it possible to reveal the original initiatives created by the Roma population to restructure its circulation. The issue of representations is dealt with in an original way using a corpus of more than 200 press articles suggesting a problematic integration in the local space. ; Cette thèse s'inscrit dans une démarche compréhensive de la circulation des familles Rroms dans la région Poitou-Charentes en France et en région Wallonne en Belgique. Si le stationnement des Voyageurs est cadré par une loi spécifique en France, l'accueil en Belgique n'est pas organisé et reste épars. En France, face à ce contexte législatif, souvent répressif, les familles tentent de pérenniser leurs pratiques circulatoires. Cette circulation, érigée en " projet circulatoire " est analysée à l'aide d'entretiens individuels et collectifs, d'observations directes ainsi que d'une période d'immersion d'une durée de cinq ans au sein d'un groupe manouche de Charente-Maritime (France). Elle éclaire ainsi la ...