Bullhead (Dutch: Rundskop) is a 2011 Belgian crime film written and directed by Michaël R. Roskam and starring Matthias Schoenaerts.

Jacky Vanmarsenille, a young Limburgish farmer, is approached by his veterinarian to make a deal with a West-Flemish beef trader to use growth hormones on his cattle.

But the murder of a federal policeman, and an unexpected confrontation with a mysterious secret from Jacky's past, set in motion a chain of events with far-reaching consequences.

[4] In Sint-Truiden, cattle farmer Jacky (Matthias Schoenaerts), who runs the family business, visits a distant relative and intimidates him into selling cows.

In the Limburg province, a mafia deals in illegal hormones and controls the cattle and meat trade.

A West Flanders mafia thug returns a car to two bumbling Walloon mechanics, who had earlier stolen it for him, and tells them to make it disappear.

They find a bullet hole and see a news report about a murdered police detective and realize the car was involved.

After Jacky's dad takes the boys home, they ride their bikes back to see Lucia, but are caught by Bruno.

It was based in part of on the 1995 murder of government livestock inspector Karel van Noppen, who was investigating the use of growth hormones by farmers.

[5][1] Schoenaerts trained up to twice daily, six times a week, bodybuilding over a three-year period to put on 27 kg (60 lb) of muscle to represent Jacky as a man dependent on steroids.

The website's critical consensus states, "Anchored by Matthias Schoenaerts' searing performance, Bullhead is a grim and gripping thriller with the cinematic sinew to match its domineering star's physicality".

[9] While criticizing the film's awkward flow due to its use of flashbacks, Roger Ebert of the Chicago Sun Times praised the performance of lead actor Matthias Schoenaerts, noting that "The one excellent aspect of the film is Matthias Schoenaerts' performance.

[...] [The film] impresses because of the pain, sadness and rage contained in the title performance by Flemish actor Matthias Schoenaerts, who bulked up for the role (without steroids), and seems ready to burst from his clothes and even his skin.

[7] Schoenaerts won the FIPRESCI Award for best actor at the Palm Springs International Film Festival.

The jury praised the actor’s "superb portrayal of an innocent and sensitive man trapped in a truculent body.