未穿内裤、免着内裤（英语：going commando）为一服装穿着上的俚语，用来通称下半身无需一般内衣物的状态（对男性称free-balling，对女性则称free-buffing）。

有些特定款式的服装，如自行车运动短裤在设计穿着时无需内衣裤，而苏格兰裙在历来传统上并不另穿内衣裤。这种免穿内衣裤情况也适用在大多数的泳衣、运动服或各式睡衣。

日语「ノーパン」称下半身未着其他内衣物，例如已穿着裤装或裙装，但只是未着内裤（并未裸体或完全未着衣）——和制英语ノー・パンツ（no pants）、ノー・パンティー（no panties）两者的略称。

Going commando, or free-balling for males and free-buffing for females, is the practice of not wearing underpants under clothes.

Certain types of clothes, such as cycling shorts, some ordinary shorts such as Bermuda shorts, also sweatpants, jogging pants and kilts, are designed to be worn or are traditionally worn without underwear. This also applies for most clothes worn as swimwear, sportswear or nightwear.