A dive tank support device for supporting a dive tank while a diver is attempting to attach the dive tank to the diver's body immediately before jumping from a vessel and beginning a dive. The dive tank support device may be formed from a body having a bottom support adapted to support a dive tank and at least one sidewall extending up from the bottom support and configured to limit tilting of the dive tank relative to the bottom support. The body supports the dive tank and the recess enables the dive tank to be easily pulled from the dive tank support device once a diver has attached the dive tank to himself.