The present study evaluates the effects of silica fume (SF) addition on engineering properties of high-performance marine mortar (HPMM), including compressive strength, flexural strength, drying shrinkage, water absorption, and sulfate attack. Four HPMM mixtures were designed with different contents of SF (0%, 5%, 10%, and 15%) and tested following the guidance of the relevant standards. The results show that the compressive strength and flexural strength values of the 56-day-old HPMM samples were in the range of 45.2 – 49.2 MPa and 10.5 – 13.8 MPa, respectively. This study found that the appropriate content of SF was 10% that increased compressive strength up to roughly 2% while this increment of flexural strength was considerably over 28% after 56 days. In addition, the HPMM prepared with SF addition exhibited higher sulfate resistance and a better ability to restrain drying shrinkage. Moreover, the water absorption rates of the HPMM ranged from 7.8% to 8.9%, with the lowest absorption level was found at the samples containing 10% SF. Therefore, the results of this study demonstrated a high possibility of producing HPMM for marine constructions with the incorporation of SF. Especially the application of HPMM in repairing and strengthening the damaged concrete components.