John Welsh

• John Welsh of Ayr, religious leader
• John Welsh of Irongray, religious leader
• John Welsh , Irish actor
• John Welsh , Australian rules football player for Essendon
• John Welsh , American physiologist
• John Welsh , Bishop of Trinidad and Tobago, 1904–1916
• John Welsh , American diplomat
• John Welsh , English football player for Grimsby Town
• John Welsh , FRS, Superintendent of Kew Observatory
• Jon Welsh, Scottish rugby union player