OTF

OTF may refer to:

Science and technology

 * OTF knife, or sliding knife, a type of pocketknife
 * OpenType, a standard for digital typography (file extension )
 * Optical transfer function, a metric for evaluating optical systems
 * Triflate, in organic chemistry, a functional group represented by the symbol -OTf
 * Off-the-film metering, in camera metering systems, a type of through-the-lens metering

Other uses

 * Order of the Falcon, order of chivalry in Iceland
 * Obstructing the field, an infringement in cricket
 * Only the Family, an American hip-hop collective and the associated record label, OTF
 * Ontario Teachers' Federation, Canada
 * Open Technology Fund, an American nonprofit corporation