Lady Gertrude Thomson (née Bremner) was the wife of Sir Graeme Thomson, Governor of Nigeria 1925–1931. She presided over Government House Lagos during the global slump that bankrupted the Marketing Boards and the introduction of female taxation in the Eastern Provinces that triggered the 1929 Aba Women's War (Ogu Umunwanyi) — the first mass anti-colonial revolt by Nigerian women.
Her public role was confined to the chartered functions of a colonial governor's wife — Red Cross patronage, the Lagos Ladies' League, hospital ward visits — but the Aba and Birrell Gray Commissions of Inquiry that followed the killing of at least 55 women at Opobo and Utu Etim Ekpo in December 1929 framed the political climate of her tenure. She left Lagos with her husband on his recall to London in 1931.