a person committed to dieting

Dieter Dengler (1938-2001), Vietnam War veteran

Dieter Schnebel (b. 1930), composer

Dieter Township, Minnesota

Dieter Hallervorden (b. 1935), German comedian

Dieter Meier (b. 1945), Swiss musician

Paul Dieter, sound engineer and record producer

Giovanni Battista Dieter, bishop

Walter Dieter, Canadian First Nations leader

Dieter Lüst, physicist

Dieter Kühn, East German football (soccer) player

a German given name (either from Diether, Germanic theod+heri "people warrior" or a short form of Dietrich theod+ric "people ruler", see Theodoric)

the demon in Norman Mailer's book, The Castle in the Forest

Dieter, a recurring character on Saturday Night Live played by Mike Myers and host of a fictional German television show skit called Sprockets