A question in the Modern Studies Intermediate 2 test paper about women in politics misspelled the first name of Johann Lamont as 'Joann'.
A notice was issued along with the exam papers to highlight the mistake and invigilators informed pupils before they started.
The Scottish Qualifications Authority (SQA) said the error was "identified during the editorial process" and would not have affected pupils' understanding of the question.
Labour said it hoped the mistake did not put any pupils off.
An SQA spokeswoman said: "A correction notice was issued alongside the Modern Studies Intermediate 2 paper, relating to a spelling mistake of Johann Lamont MSP.
"It is standard practice for exam invigilators to make candidates aware of the correction prior to the start of the exam.
"This error was identified during the editorial process and would not have affected the understanding or interpretation of the question."
Ms Lamont used to be a primary school teacher before entering politics and a Labour Party spokesman said: "Clearly, standards have slipped since Johann Lamont left teaching."
He added that Education Secretary Mike Russell had misspelled "First Minister" in an official letter in 2012, saying: "This latest mistake is not a surprise.
"Let's hope it didn't put any pupils off and they all did well in their exams today."
In other exams, thousands of pupils became the first batch to sit the new National 5 tests today, which replace standard grades.