Peak electricity usage times (peak demand). See also off-peak

A breast

Peak District in the north of England

Hubbert peak theory or peak oil, a theory that oil production worldwide is expected to reach a maximum level after which it will decline

Pikes Peak in Colorado, United States

Peak Practice, a British television drama series

Victoria Peak in Hong Kong

BIAS Peak – a professional audio editing program on the Apple platform

Stephen Peak, Australian lawyer and radio personality

A school (which is named): Peak to Peak Charter School

A reference to peak experiences

Peak Records, a record label

More specifically, a pyramidal peak, a mountaintop that has been sculpted by erosion to form a point

PEAKS SOFTWARE performs de novo peptide sequencing and protein identification on mass spectrometry data.

The British English term for the part of a hat known as the visor in American English

A mountain peak

Peak (mathematics), an (n-3)-dimensional element of a polytope

An international scout and guide week-long camp, held in the grounds of Chatsworth, Derbyshire, UK every five years; the last two events were Peak 2000 & Peak 2005

Peak Studios is a recording studio based in Horley, United Kingdom

The highest, or sometimes the highest and lowest (see peak-to-peak), points on a varying waveform

A nicknamed used to refer to British class 44 diesel locomotives, and also classes 45 and 46, since Class 44s were named after British hills and mountains, but the name also stuck for the outwardly near identical Class 45s and 46s, even though these carried different names.