Canada and Belgium have taken similar action.
TikTok said bans had been based on "misplaced fears and seemingly driven by wider geopolitics", adding it would be "disappointed by such a move" in the UK.
The UK Parliament closed its TikTok account last August. The Downing Street TikTok page has not been updated since Boris Johnson left office in September last year but others, including Energy Secretary Grant Shapps, have updated their pages more recently.
The US banned TikTok from official devices in December, and the European Commission followed suit on 23 February.