Outside Castle is the fifth and final studio album by South Korean boy group H.O.T., released on through SM Entertainment on September 29, 2000.

[1] The album spawned three singles: the title track "Outside Castle", "We Can Do It", and "A Song For a Lady".

The proportion of self-composed songs, which had been gradually increasing, reached 100% for the album as all of the record's tracks were written or produced by the group members.

On September 25, 2000, SM Entertainment revealed that the album received over 800,000 pre-orders, with sales expected to surpass ₩3 billion within the month.

[6] A live album recording of the concert was released on April 27, 2001, which sold 138,616 copies.