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Recently, The Internet of Vehicles (IoV) concept is becoming very popular due to sharing of the data between vehicles and the infrastructure. The sharing of data is very important for enhancing vehicular services, but at the same time makes IoV vulnerable for security and privacy issues. The smart and interconnected vehicles produce sophisticated services for transport authorities, car manufacturers, vehicle owners, and other service providers. IoV are very vulnerable to malicious attacks due to its self‐organizing nature and the open source nature of its implementations. This exposes the smart and interconnected vehicles to a variety of privacy and security threats, such as a remote hijacking or location tracking of vehicles. Thus, the security for IoV environment is critical. Blockchain technology has been recently used for cybersecurity due to the robustness and integrity preserving nature of its design. This review article provides a detailed survey of existing work in the literature to secure IoV through blockchain techniques such as security, privacy, reputation, distributed, decentralized, data sharing, authentication, and trust‐based approaches. The paper presents the detailed discussion and analysis of these blockchain techniques to secure IoV. In addition, we present the gaps and research challenges identified from the existing research works. This provides work directions for future research in blockchain techniques to secure IoV.