Carbonate sediments are found worldwide and are of significant importance, especially those found in regions where there are major offshore energy development projects. Due to the fragile nature of their particles, carbonate sediments generally show engineering characteristics that are significantly different compared to their non-carbonate counterparts. Although behaviour of carbonate sediments has been extensively investigated in recent years, there is still lack of data in the public domain on cone penetration testing (CPT) response on these sediments. Based on the authors' experience on commercial projects, the CPT response of carbonate sediments is different to non-carbonate sediments. Therefore, the interpretation methods and relationships available in the literature based on non-carbonate materials are not directly applicable for carbonate sediments. This paper presents a systematic database of cone penetration testing and its response in different types of carbonate sediments. Typical CPT data from major offshore project sites representing different type of materials ranging from uncemented fine grained (Muds and Silts) and coarse grained (sand) sediments to variably cemented carbonate sediments are examined. The standard practices for in-situ CPT testing and any modification to existing techniques that are relevant to carbonate sediments are also discussed. The CPT results are compared with the data available in the literature to highlight special/unusual features that are unique to carbonate sediments. The CPT results are then used, in combination with laboratory test data, to evaluate the suitability of standard soil behaviour type charts/indices and empirical correlations which are developed based on non-carbonate materials available in the literature. The modifications required to the existing relationships and techniques developed based on non-carbonate materials to characterise the response of carbonate sediments based on CPT data is also discussed. Some examples and limitations of the available CPT based methods to engineering analyses for carbonate sediments are also discussed in the paper.