The term attachment may refer to the following:
- the act or process of connecting one thing to another
- a extra part or piece of equipment that is or may be attached to a device or implement to perform a particular function
- a legal seizure of a debitor's property, or a writ ordering such a seizure
- Attachment theory, a psychological theory that attempts to describe the dynamics of interpersonal relationships between humans
- Up?d?na (meaning attachment, clinging or grasping in Sanskrit), one of the two primary causes of suffering in Buddhism
- Moh, a vice, meaning love and attachment to worldly things and relations, in Sikh belief
- Precision attachment, a part of a removable partial denture made of plastic, metal or a combination of both
- Parallel ATA (originally AT Attachment), an interface standard for the connection of storage devices in computers
- rental accessories and attachments, embedded, external or consumable parts or items that are included but may be billed separately from rental equipment
- Attachments, a British TV dramedy about an Internet startup company that ran from 2000-2002