Exhibit 21

Nabors Industries Ltd.
Significant Subsidiaries
As of December 31, 2006

Subsidiary

Nabors Drilling Canada ULC

Nabors Drilling International Ltd

Nabors Drilling USA, LP

Nabors Drilling Limited (Canada)

Nabors Holding Company

Nabors Industries Inc.

Nabors International Finance Inc

Nabors International Holdings Ltd

Nabors Malta Holdings Company Ltd.

Nabors International Management Ltd

Nabors Canada LP

Ryan Energy Technologies Inc.

Oak Leaf Investments Inc

Nabors Diamond Holdings, Inc (formerly Pool Company)

Nabors Well Services Co

Yellow Deer Investments Corp

Nabors Global Holdings Ltd

Nabors Hungary Kft