Kyainseikgyi Township (Phlone: လာ့တ်ုကဝ်သၞေဝ်ဖါဍောဟ်ဍုံကၞင့်; Burmese: ကြာအင်းဆိပ်ကြီးမြို့နယ်, pronounced [tɕàʔɪ́ɰ̃sʰeɪʔtɕí mjo̰nɛ̀]) is a township of Kyainn Seikkyi District in the Kayin State of Myanmar.

It is the fourth-biggest township in Kayin State.

The two main sub-towns are Kyeikdon and Payathonsu.

It is drained by the Zami, Winyaw and the Haungtharaw rivers.

This Kayin State location article is a stub.