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Castle (2009) fanart Welcome to Castle (2009) at WatchOnlineFree.TV, a great website for those who love to watch Castle (2009) online for free. Here you can stream all episodes online without having to downloading any additional software on your computer. If you missed the latest Castle (2009) episode on TV, make sure to check our website to follow up on this series!


Latest episode, aired 22 days ago.

The Greater Good
Episode 19
Air Date: Mar 24
Season: 6

The Greater Good

Castle and Beckett investigate the murder of a Wall Street trader, but the case takes a shocking turn when the they discover the victim was …

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The Way of the Ninja
Episode 18
Air Date: Mar 17
Season: 6

The Way of the Ninja

When a Japanese ballet dancer is mysteriously murdered, Castle and Beckett's investigation into her secret life uncovers evidence that she w…

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In the Belly of the Beast
Episode 17
Air Date: Mar 3
Season: 6

In the Belly of the Beast

Beckett is recruited to assist on a Narcotics investigation, but a routine mission turns deadly when an undercover operation goes awry. To s…

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Room 147
Episode 16
Air Date: Feb 24
Season: 6

Room 147

When a guilt-ridden young woman confesses to the murder of a struggling actor -- knowing details only the killer could know -- Beckett and C…

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Smells Like Teen Spirit
Episode 15
Air Date: Feb 17
Season: 6

Smells Like Teen Spirit

The murder of a high school mean girl draws Castle back to one of his many alma maters, where he is giddy to learn that the evidence points …

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