Breznik (Bulgarian: Брезник) is a town in western Bulgaria, 50 km away from Sofia. It is located in Pernik Province and is close to the towns of Bankya and Pernik. It has 4,500 inhabitants. Villages in the municipality include Dushintsi.

Breznik was first mentioned in the 11th-century Story of Isaiah and Bulgarian Apocryphal Chronicle as БР(Ѣ)ЗНИКЪ; it was already a city by then. The town was mentioned throughout the 15th-19th centuries, attesting its continuous existence. Its name is derived from the Bulgarian word breznik, referring to a birch forest, from the word for birch, бреза (breza). It is cognate to the Czech placename Březník.

Breznik Heights on Greenwich Island in the South Shetland Islands, Antarctica is named after Breznik.

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Tony (aka Anton) Breznik (born September 22, 1984) is an Austrian bodybuilder.

Breznik was born in Judenburg, Styria. Through his father he got to know and love the sport of ice hockey. He began to play ice hockey already at the age of 5. He was active in the teams of Zeltweg and Villach.

After a foot injury Breznik began to train with weights. The rehabilitation, however, became real bodybuilding. In 2005 he entered a bench press competition, in which he won the class up to 100 kg.

He was then invited to compete on the bodybuilding stage. At the age of 21, he entered his first physique contest, the 2005 IFBB Austrian Cup in Wels. He was winner of the junior class over 75 kg and overall juniors' winner. At this event Breznik was discovered by Ultimate Nutrition, a sports nutritional supplements company that offered him a sponsorship contract. Once a year he went to the U.S. for training and photo shoots and spent some time at fairs and exhibitions. At the FIBO in Essen, he was always invited to performances of his physique.