This thesis analyzes the legal nature of silence as a form of manifestation of intent in the commercial law of Croatia and Austria, with a particular focus on the differences in normative solutions and legal effects. Unlike general contract law, which typically does not recognize silence as acceptance of an offer, commercial law, guided by the principles of efficiency, economy, and trust, grants legal significance to silence in certain situations. In the Croatian legal system, Article 265 of the Obligations Act stipulates that the silence of the offeree, especially in the context of ongoing business relationships, may constitute acceptance of an offer. This rule is based on the presumption of trust and the regularity of business conduct between the parties, whereby the offeree's failure to reject an order is interpreted as a conclusive act of acceptance. In Austrian law, Article 863 of the Austrian Civil Code regulates silence as a form of acceptance of an offer in cases where business customs or the nature of the transaction so require. The key difference between the two legal systems lies in the extent of the obligation for the offeree to manifest their intent. Croatian law imposes an obligation of active expression of intent in business relationships, while Austrian law places greater emphasis on the freedom of contract and the adaptation to industry-specific customs. The thesis highlights the role of silence within the framework of ongoing business relationships, where it can have significant legal consequences for the parties involved. In conclusion, the analysis of the institute of silence demonstrates how commercial law adapts to the needs of the modern economy, striving to achieve a balance between the autonomy of the parties' will, legal certainty, and the preservation of trust in business relations.