In this paper I’m trying to emphasize the crucial significance of Liturgy in church architecture. The inner area of the church should, in the first place, respond to the liturgical needs for which it was designed. By general overview of the development of church architecture, given in the introductory section, it is easy to come to a conclusion that in the history Liturgy had crucial impact on the inner architecture of the church. The overall objective of this paper is to underline the necessity that, even today, when new churches are being designed, one should always start from Liturgy and its needs. That is the way that leaves no room from mistakes.