Bacteriophage TAC1 was isolated using a clinical isolate of Acinetobacter baumannii as the host. It showed stability over wide pH and temperature range and has exhibited in vitro antibacterial activity when applied at an MOI of 1. It demonstrated a broad intraspecies host range and infected 66% of the isolates tested. It has produced 454 virions from a single bacterium with a short latent period of 15 minutes. TAC1 has a linear dsDNA genome with a length of 101.77 kb and 37.5% GC content. The genome encodes 161 proteins and 13 putative tRNAs. Whole-genome sequence comparisons using BLASTn and phylogenetic analysis showed that TAC1 is related to unclassified bacteriophages of the family Myoviridae.