The Harmonized Malaysian Ageing and Retirement Survey (Harmonized MARS) is an easy-to-use version of data from the first wave of the Malaysian Ageing and Retirement Survey (MARS) with a set of harmonized variables suitable for cross-country analysis. Using the RAND HRS and Harmonized HRS as models, the Harmonized MARS defines variables as identically as possible with the RAND HRS and Harmonized HRS to allow users to compare variables with all other Harmonized data sets. Documentation for each variable in Harmonized MARS, including a description of its creation, the MARS variables used, and descriptive statistics, is detailed in the Harmonized MARS codebook.