- Kimball "Kim" O'Hara – an orphan son of an Irish soldier, the protagonist; "A poor white, the poorest of the poor"
- Kimball O'Hara Sr. - Kim's father
- Teshoo Lama – a Tibetan lama, the former abbot of the Such-zen monastery in the western Himalayas, on a spiritual journey
- Mahbub Ali – a famous Ghilzai Pashtun horse trader and spy for the British[5]
- Colonel Creighton – a British Army officer, ethnologist, and spy
- Lurgan Sahib – a Simla gem trader and spy
- Hurree Chunder Mookherjee (Hurree Babu, also the Babu) – a Bengali intelligence operative working for the British; Kim's direct superior
- Reverend Arthur Bennett – the Church of England chaplain of the Mavericks, the fictional Irish regiment to which Kim's father belonged
- Father Victor – the Roman Catholic chaplain of the Mavericks
- Huneefa – a sorceress who performs a devil invocation ritual to protect Kim
- E23 – a hunted spy for the British, whom Kim helps by effectively disguising him
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