Jam Mir Mohammad Yousaf Aliani (Urdu: جام مير محمد یوسف عالياني; February 14, 1954 – February 16, 2012) was the 12th Jam of Lasbela, and a former Chief Minister of the Balochistan province of Pakistan.

Mir Jam Mohammad Yousaf was born in 1954 at Lasbela, Balochistan. He belonged to the Koreja family of the Samma tribe which once ruled over Sindh.

Yousaf served as the Chief Minister of Balochistan province from 2002 to 2007. He was the Minister for Water and Power, Railways and a Minister in Balochistan assembly. Previously he held positions as MNA and MPA in the National and Balochistan Provincial Assembly. He was the Provincial President of PML (Q) from 2002.

On 7 October 2009, a single bench of the Balochistan High Court (BHC) comprising Chief Justice Qazi Faez Essa accepted an application of Nawabzada Jamil Akbar Bugti, the eldest son of former Balochistan Governor and Chief Minister Nawab Akbar Bugti, alleging that Yousaf, along with former President Pervez Musharraf and former prime minister Shaukat Aziz, was responsible for the killing of his father on 26 August 2006, in a military operation.

BHC ordered the sub-house officer of Dera Bugti to register a first investigation report against Yousaf. On 9 January 2010, the Supreme Court of Pakistan rejected Yousaf's plea against the BHC orders to file a case against him in the Nawab Bugti murder case.

In 2012, Jamil Bugti formally nominated Yousaf in his police report alleging that the former chief minister was responsible for his father's killing. On 17 July 2012, the BHC granted Yousaf interim bail in the case.

Jam Mohammad Yousaf died of cardiac arrest on 16 February 2012 in Islamabad, and was buried in Bara Bagh Cemetery, Lasbela.