A triple cage olfactometer for evaluating mosquito attraction responses is described. The olfactometer is designed for easy access for interior cleaning, has a mechanism that allows synchronous operation of the port doors on each cage, and requires 0.8 m(2) of floor space. it is constructed of clear acrylic, contains 3 test chambers in a tiered configuration, was paired removable sleeves and mosquito traps on each cage, and is equipped with a altered external air supply system that has temperature and relative humidity control.