Causantín atau Constantín mac Cináeda (dalam Bahasa Gaelik Skotlandia: Còiseam mac Choinnich; wafat 877) merupakan raja Pict. Dia sering dikenal sebagai Konstantinus I sehubungan dengan tempatnya dalam daftar raja Skotlandia, tetapi sumber-sumber kontemporer menggambarkan Causantín hanya sebagai raja Pict. Dia adalah putra Cináed mac Ailpín ("Kenneth MacAlpin"), ia menggantikan pamandanya Domnall mac Ailpín sebagai raja Pict setelah kematiannya pada 13 April862. Kemungkinan besar pemerintahan Causantín menyaksikan peningkatan aktivitas Viking, yang berbasis di Irlandia, Northumbria dan Britania utara. Dia terbunuh melawan salah satu invasi tersebut. Putra Causantín Domnall dan keturunannya mewakili garis utama penguasa Alba dan kemudian Skotlandia.
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