可撤销合同（Revocable contract/voidable contract），是民法中可变更和可撤销的民事行为的一种。可撤销合同主要是意思表示不真实的合同。

一方以欺诈、胁迫的手段或者乘人之危，使对方在违背真实意思的情况下订立的合同，受损害方有权请求人民法院或者仲裁机构变更或者撤销。当事人请求变更的，人民法院或者仲裁机构不得撤销。

可撤销合同的效力取决于当事人的意志，它是一种相对无效的合同，但又不同于绝对无效的无效合同。

下列合同，当事人一方有权请求人民法院或者仲裁机构变更或者撤销：

（一）因重大误解订立

those concluded as a result of significant misconception;

（二）在订立合同时显失公平的

those that are obviously unfair at the time when concluding the contract

《合同法》第55条规定有下列情形之一的，撤销权（right to revoke a contract）消灭：

（一）具有撤销权的当事人自知道或者应当知道撤销事由之日起一年内没有行使撤销权；

（二）具有撤销权的当事人知道撤销事由后明确表示或者以自己的行为放弃撤销权。

The right to revoke a contract shall extinguish under any of the following circumstances:

(1) a party having the right to revoke the contract fails to exercise the right within one year from the day that it knows or ought to know the revoking causes;

(2) a party having the right to revoke the contract explicitly expresses or conducts an act to waive the right after it knows the revoking causes.

参考双语例句：

This contradiction can be solved and the parties can be protected better when such contract is provided as voidable contract.

将以欺诈、胁迫或乘人之危订立的劳动合同规定为可撤销合同可以解决这一矛盾，并能够更好地保护当事人的利益。

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It might therefore be argued that a guarantee of a minor's obligations under a voidable contract should be enforceable prior to its repudiation, although it is only likely to be in such circumstances that the guarantee would be important.

不过，该案是根据一八七四年孩童保障法判决的，保障法判令案中的契约无效，因此可引起争论，虽然一份可予撒销契约在其捨弃前对担保方具有意义，但为一名未成年人在该份契约的义务所作出的担保，在契约舍弃前仍为可履行者。