In Deep is an album by jazz musician Mark Lockheart, released in 2009 on Edition Records.

In The Guardian, John Fordham said "Lockheart picked the right title: that's exactly where it takes you" and awarded it 4 stars.

[1] In All About Jazz, John Kelman wrote "The line-up may suggest mainstream, but this is no straight-ahead session...As impressive as Lockheart was on Moving Air, his playing has become even more muscular, combining the late Michael Brecker's visceral power with his own kind of tension-and-release.

"[2] The Yorkshire Post wrote "Lockheart's work nods to Coltrane and Michael Brecker, but he's firmly his own man.

[5] Lockheart was interviewed in Jazzwise in June 2009, where he explained that the title of the album described how improvising is about connecting with another musician at a very deep level.