This thesis is a study of incorporation in Thai verbs. The Analysis is based on the approach proposed by Jeffrey S. Gruber. The study covers only the incorporation of nouns or prepositional phrases. The first aim of the study is to classify incorporation in Thai verbs. The second is to identify the cases which can be incorporated. The analysis shows that there are three types of incorporation; obligatory, optional, and conditional. The third type is added to the first two types given by Gruber. In regards to cases, it is found that five cases can be incorporated. They are instrumental, objective, locative, source, and goal. The study also shows that incorporation mostly occurs with specific nouns, which means that incorporation is idiosyncrasy of each verbs.