This paper presents an overview of the existing literature to date regarding the usability testing of Mobile Augmented Reality applications developed for cultural heritage. A Systematic Literature Review was conducted with this purpose. Four databases were interrogated with specific keywords. Our of the 88 found research papers, only 31 met the eligibility criteria to be included in this survey. Four major usability testing methods were identified: questionnaires, focus groups, user testing and interviews. The questionnaire method was used in almost all of the studies, and only a few of them combined more usability testing methods. Nearly all papers targeted the outdoors use centered on location-based augmented reality. The perceived ease of use, usefulness and enjoyment were confirmed by a majority of the papers. The ease of use was also correlated to the ease of learning, as well as with the interest of using the application. Cultural heritage is one of the domains that can benefit greatly from the latest improvements in mobile augmented reality technologies.