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Wettability and zeta potential studies were performed to characterize the hydrophobicity, surface tension, and surface charge of P₂O₅‐glass‐reinforced hydroxyapatite composites. Quantitative phase analysis was performed by the Rietveld method using GSAS software applied to X‐ray diffractograms. Surface charge was assessed by zeta potential measurements. Protein adsorption studies were performed using vitronectin. Contact angles and surface tensions variation with time were determined by the sessile and pendent drop techniques, respectively, using ADSA‐P software. The highest (−18.1 mV) and lowest (−28.7 mV) values of zeta potential were found for hydroxyapatite (HA) and β‐tricalcium phosphate (β‐TCP), respectively, with composite materials presenting values in between. All studied bioceramic materials showed similar solid surface tension. For HA and β‐TCP, solid surface tensions of 46.7 and …