The Official Rule is NO, a Yahtzee (5 of-a-kind) cannot be counted as a Full House. A Full House is when you roll 'Three of one number and Two of another number' HOWEVER... Any confusion may come from the Joker Rules that are ONLY applied when a Second Yahtzee is rolled! The Joker Rules state that in certain circumstances the second Yahtzee can be marked in the Full House box and scores 25 points (as well as the 100 point Bonus). For a complete explanation of the Second Yahtzee Rules see the question 'What are the Second Yahtzee Bonus Rules' above.