Shailene Woodley Arrested for Trespassing

Shailene Woodley was arrested for criminal trespass while protesting the Dakota Access Pipeline ... law enforcement tells TMZ.

The 'Divergent' star was busted Monday morning for trespassing during what she called a "peaceful protest" in Sioux County, North Dakota. About 100 protesters were on a construction site for the controversial pipeline project before cops moved in and put handcuffs on Shailene.

Shailene was arrested for 2 misdemeanors ... including engaging in a riot. Cops tell us they issued multiple warnings for the protesters to leave. 27 protesters were ultimately arrested.

The planned pipeline affects sacred Standing Rock Sioux land and burial grounds. On Sunday, a Federal appeals court rejected their request to stop the construction ... which sparked the protest.