Thomas Nicolson or Nicholson may refer to:
Thomas Nicolson of Carnock (died 1646), commissioner for Stirlingshire Sir Thomas Nicolson, 6th Baronet (died 1693), of the Nicolson baronets Thomas Nicolson (bishop) (1645–1718), Roman Catholic bishop Thomas Nicolson, 4th Lord Napier (1669–1688), Scottish peer Sir Thomas Nicolson, 1st Baronet (died 1728), of the Nicolson baronets Thomas Nicholson (architect) (1823–1895), British architect Thomas Nicholson (rugby union) (fl. 1893), English international rugby union player Thomas Nicholson (cricketer) (1876–1939), English cricketer Tom Nicolson (1879–1951), British track and field athlete Thomas Nicholson (educator), American health educator and drug policy specialist
See also Nickolson Thomas (born 1982), Trinidadian footballer