RNLB Helen Smitton (ON 603) is a Watson-class lifeboat built by Thames Ironworks and Shipbuilding Company in 1910.

[1] Helen Smitton is a non-self-righting, 38-ft Watson-class lifeboat constructed from Honduras mahogany on Canadian rock elm frames and stringers.

She was powered by a 37 hp Wolseley petrol engine.

[2][3] Helen Smitton is undergoing preservation work at Marloes, Pembrokeshire, West Wales, having been reduced to little more than a bare hull in poor condition and with structural problems.

[2] She is listed on the National Register of Historic Vessels by National Historic Ships, with certificate number 2220.