阵营是在桌面角色扮演游戏龙与地下城游戏设定中，对角色、生物以及集团所持的伦理道德态度的分类。 早期版本的龙与地下城中，提供了三个阵营让玩家选择：守序，代表重视荣誉和对社会规则的尊重；混沌，代表无视荣誉、秩序和社会规则；中立，代表并非以上两种的中立立场。进阶龙与地下城又提供了另一个坐标轴：善良、中立和邪恶，与之前的坐标轴组合形成了现在的九大阵营。

一版和二版的专家级龙与地下城均使用此种阵营框架，并延续到三版的龙与地下城。2008年发行的第四版将阵营减到了五个：守序善良，善良，无阵营，邪恶和混乱邪恶。2014年发行的五版再度回复九大阵营，若加上无阵营的话实际上有十种阵营。

In some role-playing games, alignment is a categorisation of the moral and ethical perspective of the player characters, non-player characters, monsters, and societies in the game.

Not all role-playing games have such a system, and some narrativist role-players consider such a restriction on their characters' outlook on life to be overly constraining. However, some regard a concept of alignment to be essential to role-playing, since they regard role-playing as an exploration of the themes of good and evil.