While pure deliberation has still not been found online, the field of online deliberation research is blossoming. Born out of the “frustrations and possibilities” of the 1990s, a current theme in the field is to re-link deliberative theory with empirical political science. The aim of this systematic literature review is to sort out and examine important features of this development; to identify and categorise important research themes and issues as well as to pinpoint some research gaps. Using citation analysis as a method for article selection, 788 abstracts were retrieved and out of these, 130 items were chosen for further analysis. First the review shows that researchers from several different disciplines are involved in the field and that these researchers are studying online deliberation in a variety of arenas aided by a wide range of methods. Second the review reveals that the field struggles with a highly diversified concept of deliberation; that newer theoretical developments are underutilised in the operationalisation of theoretical concepts for empirical analyses, and that it there is a rather low degree of cumulativity in the field. Finally, more attention is paid on deliberation per se, rather than the political and democratic consequences of deliberation.