The event, at Beauly near Inverness, had been due to take place between 29 and 31 July, with Nile Rogers & Chic, Van Morrison, Emeli Sande and Passenger among the performers.
Festival organisers said they did everything possible to try and make the event happen, but there were “still too many uncertainties” surrounding the potential Covid-19 restrictions that may be in place.
Ticket holders have been offered the opportunity to transfer tickets to the 2022 event or receive a full refund.
A statement from festival organisers read: “After months of considered efforts, it is with deep regret that we are announcing the postponement of the 2021 Belladrum Tartan Heart Festival.
“No one wants to be back in the fields at Bella more than us, however, the status of the ongoing Covid-19 pandemic has made it clear that delivering an event we all know and love, just isn’t going to be possible this year.
“Whilst the vaccine programme appears to be progressing well and there are signs of light at the end of the very long tunnel, we feel there are still too many uncertainties surrounding the potential restrictions that may be in place.
“We don’t want to deliver an event we aren’t proud of or compromise in any way on the magic that makes Bella so special to all of us. We are aware that there are some events that are going ahead and we have considered all options for how Bella might look but the nature of the weekend camping show we have just doesn’t make it possible."
It continued: “We have been working closely with the rest of the UK event industry in lengthy conversations with Westminster Government to provide an insurance policy for our industry. Without this, the risk of pushing on with planning with no certainty on what the future holds are simply too huge.
“We have listened to you all over the last few months and whilst we know that this decision won’t please everyone it’s a decision we have made with our whole community in mind. Our community in every sense of the word is at the beating heart of our festival and we feel that postponing to 2022 is the safest decision for that whole community.
“To postpone two years in a row is a tough blow and we cannot thank you enough for your support for the festival. You blew us away in 2020 with your participation in our virtual event and your engagement throughout these really tough times has kept us all going here at Bella HQ.
“We will be offering all 2021 ticket holders the option to transfer your tickets to the 2022 event. Please rest assured that if you cannot make the 2022 festival, you will be offered a full refund for all tickets purchased.
“Until we can be together again, stay safe, look after each other… and watch this space.”