Biological entity communication channel techniques are described. In one or more implementations, an apparatus includes a signal conductor having a side that is configured to be disposed proximal to a surface of a biological entity to use at least a part of the biological entity as a transmission channel to transmit a signal received by the signal conductor from an electrical device. The apparatus also includes a ground layer configured to be disposed on an opposing side of the signal conductor from the side of the signal conductor that is configured to be disposed against the surface of the biological entity.