This chapter takes forward the exploration of marriage as difference through an examination of what are locally perceived as ‘mixed’ marriages in Penang. Difference can be calibrated in many registers – including age, wealth, class, familial background, religion, language, ‘race’ and ethnicity. The cultural and ethnic diversity of Penang offers unusual scope for marrying outside familiar boundaries. But which sorts of difference are most salient, and which boundaries are more permeable and more easy to bridge? ‘Malayness’ and Islam have a historically privileged legal status in Malaysia, and marrying a Muslim legally requires a non-Muslim spouse to convert. The bodily, culinary, religious and legal concomitants of this conversion are likely to impact close family members of a non-Muslim partner. At the extreme end of a range of possibilities, ‘mixed’ couples encountering or expecting opposition from their families sometimes elope to marry. But, after marriage, a long process of accommodation and absorption is likely to occur. Experiences of ‘mixed’ marriage and the negotiation of difference, which is part of marriage everywhere, offer a perspective on other changes in Malaysia over several decades. But more broadly, it provides a way to understand how intimate worlds may generate wider social transformation.