Lacy Walter Giles Yea (May 20, 1808–June 18, 1855) was a British Army colonel, known for his role in the Crimean War, where he was killed in action.

Born in Park Row, Bristol, on 20 May 1808, he was eldest son of Sir William Walter Yea, second baronet, of Pyrland, near Taunton, Somerset, who married, on 24 June 1805, Anne Heckstetter (d. 1846), youngest daughter of Colonel David Michel of Dulish House, Dorset.

The Fusiliers held their own against this column when the rest of Sir William Codrington's brigade had fallen back, and at length forced it to give way.

Yea received a letter of congratulation from Sir Edward Blakeney, who had led the regiment at Albuera, and was now its colonel.

At the battle of Inkerman the Fusiliers, as part of Codrington's brigade, were on the slope of Victoria ridge, acting on the right flank of the Russians, but not very heavily engaged.