Capital One is a credit card issuer that partners with both Visa and Mastercard, and even the Discover network. The specific network for your card depends on which product you choose. For example, the Capital One Venture X and the Venture rewards cards are typically issued as Visa Infinite or Visa Signature cards. On the other hand, the Capital One Savor, Quicksilver, and the Platinum cards are almost always issued on the Mastercard network. You can easily tell which one you have by looking for the logo in the bottom corner of your card. In early 2026, following Capital One's acquisition of Discover, the company has begun transitioning some of its core products to its own Discover network to reduce merchant fees, though the majority of its premium travel cards remain on the Visa or Mastercard networks to ensure worldwide acceptance, which is a key priority for their "global traveler" customer base.