Plant hormones are master regulators of developmental and genetic mechanisms to deal with diverse environmental cues. During phosphate (Pi) limitation, in vascular plants, the phytohormone metabolism is modified to coordinate morphological and molecular mechanisms to overcome such stress. However, the transcriptional program underlying hormonal signaling in response to low Pi availability in early branches of land plant phylogeny remains unclear. To shed light on this topic, we explored the transcriptional dynamics of key genes involved in auxin, cytokinin, ethylene, jasmonate, gibberellin and abscisic acid metabolism in the early divergent land plant Marchantia polymorpha, upon Pi starvation. Our RNAseq approach revealed major changes in genes associated with auxin and ethylene biosynthesis upon Pi scarcity, while cytokinin synthesis is transcriptionally repressed under the same conditions. Interestingly, genes involved in auxin and ethylene signaling such as MpARF1 and MpARF2 are upregulated as well as the MpERF. In contrast, MpARRb is down-regulated in agreement with the changes observed in cytokine biosynthetic genes. Moreover, genes involved in the synthesis of jasmonates were highly upregulated under low Pi, but those related to signaling did not change in expression. Altogether our data led us to suggest that auxin and ethylene act as positive regulators of rhizoid development under Pi limitation, whereas cytokinin may act as a negative regulator. The transcriptional behavior of sech hormone-related genes in Marchantia is similar to that previously described controlling root hair development in A. thaliana, Z. maize and O. sativa in response to Pi scarcity.