The paper describes the administrative-procedural forms of activity of public administration entities, shows their importance in the administrative process, identifies and characterizes their main features, and suggests their classification. The author describes the main approaches to the use of the concept of «procedural form» in legislation and law enforcement practice. The paper substantiates the conclusion that in the scholarly literature the administrative procedural form is understood as either a «special legal structure», «legal means», «system of requirements for the actions of a participant in the process», «the content of procedural relations» or a single administrative procedure as a whole, which does not contribute to a uniform understanding of the category under consideration and further improvement of the administrative procedure and administrative procedural legislation. The author suggests the system of requirements for administrative-procedural forms and determines the signs reflecting their content. Also, the author proposes a definition of the administrative-procedural form. In general, it is stated that the improvement of administrative and procedural regulation of the activities of subjects of public administration involves the ordering on a scientific basis of the main elements of the relevant procedural forms.