Exhibit 21

Nabors Industries, Ltd. and Subsidiaries
Significant Subsidiaries

Subsidiary

Nabors Drilling Canada ULC

Nabors Drilling International Ltd

Nabors Drilling International II 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 Holding Company Ltd.

Nabors International Management Ltd

Nabors Canada

Ryan Energy Technologies Inc.

Oak Leaf Investments Inc

Nabors Diamond Holdings, Inc

Nabors Well Services Co

Yellow Deer Investments Corp

Nabors Global Holdings Ltd

Nabors Hungary Kft

Maple Leaf Holdings Ltd.

Ramshorn Investments, Inc.

Nabors Blue Shield Ltd.