The importance of online and offline petition-signing strongly differs from one country to another. This research therefore explores the influence of national culture on offline and online petition-signing.Specifically, it draws on the Hofstede's cultural dimensions model (1980) to consider the influence of 3 cultural values: self-affirmation, preference for the short term and uncertainty avoidance. Results show that self-affirmation value has a significant and positive effect on both offline and online petition-signing. However, preference for the short term and uncertainty avoidance only have significant effects on online petition-signing. These results allow to identify potential obstacles and driving forces to promote online petition-signing