DC Comics & Marvel Comics have a good compilation of logos over the years.
Let’s take a look at the evolution of their logos from their inception to the present day.
DC Comics (1938-present)

Marvel Comics (1939-present)

And both the houses, DC Comics & Marvel Comics together launched Amalgam Comics from Dec 1996 to Feb 1997, and later once again from Dec 1997 to Mar 1998.

Now, with the arrival of Logo (an amalgamation of Logan & Lobo) in the latest Marvel/DC Crossover, let’s see how all the logos will transform further in the coming years!
Pic Credits: DC/Marvel
