Foot fetishism, also known as foot partialism or podophilia, refers to a sexual interest in feet. Similar to other fetishes, individuals with a foot fetish experience varying degrees of sexual attraction to feet, from merely viewing the foot as a pleasing part of the human body alongside other parts, to sexually activity involving feet being the only way that the fetishist can climax. It is the most commonly discussed type of partialist fantasy in pornographic Internet forums, and is the most common type of culturally atypical body part partialism,with studies estimating it to affect 14% of the human population in some way, though the amount of individuals who are only able to or usually prefer to climax to feet is likely smaller. It is most common in men, with a slight increase in gay and bisexual men, and is least common in heterosexual women.

The appeal of foot fetishism like with other fetishes is idiosyncratic, common reasons cited by foot fetishists in studies include an element of humiliation and domination, the sensitivity of the feet and its usage as an erogenous zone in sex, and as part of a greater form of olfactophilia due to foot odor. Traditional attitudes related to femininity and masculinity have also been noted in terms of symbolic parts of the fetish. The cause of any type of fetishism is largely speculative, but is thought to be a complex interplay of events in prenatal neurodevelopment, cultural, and psychodynamic factors. In rare cases, temporal lobe epilepsy can cause extreme displays of foot fetishism and other paraphilias.

Foot fetishism, when it is not accompanied by antisocial expressions of the fetish such as burglary of footwear or non-consensual contact, or considerable psycho-social distress or impairment in daily life, is considered by contemporary psychiatric and medical institutions to be a valid expression of human sexuality and not pathological. The medical treatment of those with foot fetishism that is considered pathological is the same as other fetishes and paraphilias, which is primarily focused on reducing shame regarding the sexual fantasy in psychotherapy, and if absolutely needed, psycho-pharmacological treatments to reduce impulsive behavior such as SSRIs or medications that directly inhibit the sexual libido, such as antiandrogens, as well as the treatment of co-morbid disorders due to stress being a common trigger for impulsive sexual behavior.

Shoe fetishism and boot fetishism can be connected to foot fetishism, though they are not mutually inclusive with foot fetishism.

For a foot fetishist, points of attraction may include the shape and size of feet, feet soles, toes, jewelry (such as toe rings or anklets), treatments (such as massaging, washing partner's feet, or painting partner's toenails), state of dress (such as barefoot, flip flops, or high heels), or sensory interaction (such as smelling, kissing, or rubbing of feet and genitals).

In a 1994 study, 45% of those with a foot fetish were found to be aroused by smelly socks or feet, making it one of the most widespread forms of olfactophilia.

To estimate the relative frequency of fetishes, in 2006 researchers at the University of Bologna examined 381 Internet discussions of fetish groups, in which at least 5,000 people had been participating. Researchers estimated the prevalence of different fetishes based on the following elements:

It was concluded that the most common fetishes were for body parts or for objects usually associated with body parts (33% and 30%, respectively). Among those people preferring body parts, feet and toes were preferred by the greatest number, with 47% of those sampled preferring them. Among those people preferring objects related to body parts, 32% were in groups related to footwear (shoes, boots, etc.).