Irish Hobby, a type of horse ridden by Hobelars in the Middle Ages
Hobby Airport, a public airport serving the Houston, Texas, area in the United States
Hobbyist, slang for a sex client soliciting online
Ships
USS Hobby (DD-610), a United States Navy destroyer in commission from 1942 to 1946
USS William M. Hobby (DE-286), a United States Navy destroyer escort converted during construction into the high-speed transport USS William M. Hobby (APD-95)