Urbanization generates a large volume of wastes such as sewage sludge (SS), which contains essential plant nutrients, in particular phosphorus (P). If stabilized via composting, the resulting composted sewage sludge (CSW) could be used as a source of P in agriculture, reducing the need for net inputs of P derived from geographically limited phosphate rock ores via a circular P economy. The objective of this study was to assess the ability of CSW to supply P for plants grown in calcareous vs non-calcareous soils of contrasting physical and chemical properties. Wheat (Triticum durum) was grown under controlled conditions and three treatments were applied: (1) control without P application (CON), (2) diammonium phosphate (DAP) – a common synthetic P fertilizer, and (3) CSW. Both DAP and CSW were applied to supply 50 mg P kg-1 soil. After 69 days of composting, the P content was 46% higher in CSW than in SS (24 g kg-1 vs. 16.4 g kg-1). In the pot experiments, total soil P concentrations increased by 11% with DAP and CSW relative to CON. The P content of wheat grain was similarly higher under DAP and CSW than CON (>19%) across soils. Additionally, CSW increased harvest index and one-grain weight in the calcareous soil relative to CON plants. Moreover, CSW and DAP produced similar P uptake in wheat, significantly higher than the non-application of P. Our findings support the potential of CSW as a viable P source for wheat cultivated in calcareous and non-calcareous soil types in Europe