This chapter surveys whether and how courts in India apply VCLT rules, particularly Articles 31–33, when they interpret treaties. It looks at both adherence to Vienna rules (either through nominal adherence or corresponding methods) and coherence of interpretive principles across different cases and settings. Insofar as India is not a signatory to the VCLT, the use of similar rules can be viewed as either application of customary international law or the adoption of convenient guidelines. The VCLT is referred to most frequently in cases involving the interpretation of Double Taxation Avoidance Agreements (DTAAs), and it is asked whether this constitutes a specialized regime or whether these should be taken as an indication of a general approach within India.