Diesel is a popular slang term for heroin

Diesel engine

Diesel locomotive

Biodiesel, a fuel for diesel engines, made from vegetable oil

Diesel is a popular brand of sunglasses.

Diesel multiple unit

Rudolf Diesel, the German engineer who invented the Diesel engine

John "the Diesel" Riggins, an NFL football player for the Washington Redskins (1970-80s)

Diesel Sweeties, the popular webcomic

Johnny Diesel, an Australian rock singer (born Mark Lizotte, also known simply as Diesel)

Dieselboy, A popular American Darkstep Drum and Bass artist.

Vin Diesel, an American actor

Diesel cycle

Greg "Diesel" Williams, a two-time Brownlow Medallist in Australian-rules football, 1980s

Diesel, a Dutch band who recorded "Sausalito Summernight".

Diesel, an energy drink

Diesel is a brand of Aftershave

Diesel, a petroleum-based fuel for diesel engines

Lubrication oil for use in diesel engines, e.g. API CD spec.

Diesel, a character from The Railway Series

The Diesel (aka D261), another character in Thomas the Tank Engine and Friends

Kevin "Big Daddy Cool Diesel" Nash, and later Glen Jacobs, professional wrestlers, 1990s

Shaquille O'Neal, current Miami Heat center is known as "The Big Diesel", among other nicknames.

Joe "Diesel" Riggs, a mixed martial artist who has competed in the UFC several times.

Diesel S.p.A., a clothing company based in Molvena, Italy

Diesel is a slang term for certain varieties of Snakebite, a cocktail made with beer and cider

Diesel is an illegal, highly vicious version of street hockey in the webcomic. "Templar, Arizona".