Krokek is a locality situated in Norrköping Municipality, Östergötland County, Sweden with 4,285 inhabitants in 2010.

The place's name comes from krokig ek, which refers to a crooked oak at the border between Östergötland and Sörmland.

The names of other parts in Krokek often originates from the late Middle Ages and forward, with some exceptions such as Svintuna.

What is thought to be the oak in question split during a storm in 1902, and a 6 meter tall, hollow trunk stood until it was cut down in 1912.

It was along this railway that the Getå railroad disaster occurred, Sweden's largest train accident of all time.