This study investigates cross-linguistic influences (CLIs) on speech rhythm observed in bilingual (L2) and trilingual (L3) speakers of French. 42 participants included Chinese-English/French bilinguals, Chinese-English-French trilinguals, and three respective monolingual control groups (L1). Participants performed an oral reading task of 18 utterances (SVO). L1/L2/L3 speech rhythm was analyzed via six metrics: ΔC, VarcoC, rPVI-C and %V, VarcoV, nPVI-V. Our goal was to examine how previously learnt/acquired languages constitute a CLI in the acquisition of L2/L3 French rhythm and also to evaluate potential regressive CLI (from L2/L3 to L1). Our results showed that trilingual speakers experienced progressive interference from their L2 English to L3 French on the inter-vocalic metrics (ΔC, VarcoC, rPVI-C). In their L2 English, we found reinforced negative CLIs in the VarcoC, VarcoV and nPVI-V metrics from L1 and L3. Moreover, regressive CLI from their L2 to L1 on the three inter-vocalic metrics was found. We report to what extent these regressive CLIs could affect the rhythm in the L1 for vocalic metrics (%V, VarcoV, nPVI-V) depending on their linguistic repertoire. We propose that these regressive CLIs cause a systematic rhythmic reorganization. Our results may contribute to better understand how progressive and regressive CLIs take place in multilingual rhythm.