George Maydwell Holdich (14 August 1816 – 30 July 1896) was a British organist and organ builder based in London.
He was born on 14 August 1816, the third son of Revd. Thomas Holdich (Vicar of Maidwell) and his second wife Elizabeth Laura Maydwell.
He was educated at Uppingham School and Cambridge University, but left to obtain an apprenticeship to the organ builder James Chapman Bishop. He set up his own business at 12 Greek Street, in the same building as Henry Bevington, and is thought to have built his first organ in 1837.
He moved to 4 Judd Place East (renamed 42 Euston Road in 1858) in 1854 and in 1866 to 24 Park Place West, Liverpool Road. He sold this business to Eustace Ingram.
In 1851 he produced an organ which was exhibited at the Great Exhibition. His greatest achievement was the new organ for Lichfield Cathedral in 1861 which had 52 stops.