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The terms time-bias and space-bias describe concepts that anchor communications theorist Harold Innis's understanding of dominant communication technologies in history.

Innis developed the idea of time- and space-bias to describe the way in which the media operate in society: time-biased media favour the preservation of knowledge over long periods of time, whereas space-biased media favour the dissemination of knowledge over great distances. The bias of communication directly influences the way media exert control and, consequently, the way society is organized.

Harold Innis says this, mainly that space bias reaches a broader audience, however, is not permeable. Unlike time bias, which is permeable but is not physically able to reach as many people.