John Charles Ogilvy-Grant, 7th Earl of Seafield KT (4 September 1815 – 18 February 1881), styled Viscount Reidhaven from 1840 to 1853, was a Scottish nobleman.
Seafield was the eldest son of Francis William Ogilvy-Grant, 6th Earl of Seafield, and Mary Ann Dunn. He succeeded his father as Earl of Seafield in 1853. From 1853 until 1858 he sat in the House of Lords as a Scottish Representative Peer. The latter year he was created Baron Strathspey, of Strathspey in the Counties of Inverness and Moray, in the Peerage of the United Kingdom. This title gave Seafield an automatic seat in the House of Lords. He was further honoured in 1879 when he was made a Knight of the Thistle.
Lord Seafield married the Honourable Caroline Henrietta Stuart in 1850. He died in February 1881, aged 65, and was buried next to his father at the mausoleum at Duthil Old Parish Church and Churchyard, just outside the village of Duthil, Inverness-shire. He was succeeded in his titles by his son Ian Charles Ogilvy-Grant. Lady Seafield died in 1911.