Which of the following breaches involves an unlawful entry onto a property?

Trespass is the term that specifically describes the unlawful entry onto someone else's property without permission. This act can involve physical invasion, such as walking onto someone else's land or entering their home without consent, and it is often associated with violating a person's right to exclusive possession of their property. The essence of trespass lies not just in the action but in the lack of authorization or consent from the property owner.

In contrast, fraud generally relates to deception with the intent of securing an unlawful gain, usually in financial contexts, while financial mismanagement pertains to incorrect or inappropriate handling of finances, which has no direct connection to physical property. Perjury involves the act of lying under oath, which does not pertain to property rights or entries. Thus, trespass is the only term relevant to unlawful entry, underscoring its distinction from the other concepts presented in the question.