BA-5 may refer to:
Medicine the lineage BA.5 of the SARS-CoV-2 Omicron virus variant
Aircraft BAaer BA-5 Gurí, an Argentine ultra-light aircraft BA-5, a Chinese unmanned target drone conversion of the Soviet Mikoyan-Gurevich MiG-15bis single-seat fighter Bell XLR-81-BA-5, a cancelled American rocket engine