Buhari, 74, walked unaided from his plane after it landed at an air force base in the northern city of Kaduna.
The former military ruler's health has been in the public spotlight with even suggestions that he had died, while some claimed of he had a cancer related illness.
"I am feeling much better now", his personal assistant, Bashir Ahmad, quoted him as saying on Twitter. "All I need is to do further followups within some weeks".
According to him, the return of Buhari at this time will put to end the uncertainty and the conspiracy theories that attended his 50 days absence.
Malam Musa Mohammed, a local farmer, could not control his tears of joy, said: "At last the president is back to the country".
Some of them, who spoke in Jalingo, said that the return of the president had laid to rest, rumours making the rounds about his whereabouts.
Nigerians on social media-including Buhari's wife, Aisha-welcomed the president back.
The youths will celebrate Buhari's return to the country on a large scale. The country is now undergoing an economic recession, largely because of the fall in the price of its chief export, oil. The country is one of Africa's biggest oil producers. Also in the team was the Speaker of the House of Representatives, Hon.
"The PDP will continue to pray for the president; all Nigerians should do same".
Speaking to dignitaries in the capital, Abuja, after returning from seven weeks of medical leave in the United Kingdom, he said he is "feeling much better now" but added that further medical checks would be required.