The paper presents three historical methods for classifying slavic verbs into conjugational types: according to the infinitive stem, according to the present stem, and according to the basic stem. Three contemporary classifications of Croatian verbs are presented, their characteristics given, and their advantages and disadvantages identified. The inconsistence of verb stem definitions and the inconsistence of the rules governing the formation of verb forms given in Croatian grammars is criticized. New definitions of the infinitive and present stem and the infinitive thematic suffix are proposed. An overview of the development of present tense in Croatian is presented and the present thematic suffix and present conjugational types are defined. Definitions of the verb class and type are given, and a list of characteristics which differentiate between different conjugational classes is proposed. A new classification of verbs into conjugational types and classes is proposed. Finally, in accordance with the new classification, all the verbs in the Croatian language are described. Verbs are classified into types according to the infinitive thematic suffix, into subtypes according to the suffix in the past passive participle, and into classes according to previously defined characteristics. In the conclusion, the definitions and the new classification are systemathized.