International House of Pancakes
IHOP was established in 1958 as the International House of Pancakes.
From 1995 to 2003, this logo was used simultaneously with the next, more simplistic logo. In 2003, it was gradually phased out in favor of the next logo. It is still used at a few scant locations.
Similar to the previous logo, except the "International House of Pancakes" wordmark was simply replaced with the acronym "IHOP". This is because of the company's renaming to said name. This logo is still used at some locations.
This marks as the long-running IHOP logo, lasting for 21 years.
In June 2015, IHOP changed its logo for the first time in 21 years (as the former was "frowning"), with a logo containing a curve under it resembling a smile (the "O" and "P" are the eyes while the half of "P" serves as the nose). This was used in order to make IHOP "happier".