Exhibit 21.1

Lydall, Inc. Subsidiary List as of December 31, 2015

I.             Parent Company

Lydall, Inc.

II.           First tier

Lydall Thermal/Acoustical, Inc.

Lydall Performance Materials, Inc.

Lydall International, Inc.

LDL C.V.

Southern Felt Company, Inc.

III.          Second tier

Lydall Asia Limited

Lydall Thermal/Acoustical Sales, LLC

Lydall Netherlands B.V.

IV.          Third tier

Lydall Thermal/Acoustical (Taicang) Company Limited

Lydall Performance Materials B.V.

Lydall France S.A.S.

Lydall Holdings GmbH

Lydall UK Ltd.

V.    Fourth tier

Lydall Performance Materials S.A.S.

Lydall Thermique/Acoustique S.A.S.

Lydall Gerhardi GmbH & Co. KG

Lydall Industrial Filtration (EMEA) Limited

Lydall Industrial Filtration Textile Manufacturing (EMEA) Limited

Andrew Industries (Hong Kong) Limited

VI.    Fifth tier

Health Filtration Limited

Lydall Industrial Textile Manufacturing Company (Shanghai) Limited

Andrew Industrial Textile Manufacturing Company (Wuxi) Limited

Andrew Industrial Textile Trading Company (Shanghai) Limited