Disclaimer: The inclusion of any hotline here does not indicate the author's endorsement of the hotline. The author cannot guarantee positive, safe, or healthy experiences with the hotlines listed.

Mental Health Hotlines

• US: 1-630-482-9696 (Suicide Prevention Services of America and Suicide Prevention Lifeline; also has hotlines specifically for suicide prevention at 1-800-273-8255 (1-800-273-TALK) and 1-800-784-2433 (1-800-SUICIDE) as well as a hotline for Spanish speakers at 1-888-628-9454 and for individuals who are d/Deaf or hard of hearing at 1-800-799-4889; also allows chat; accepts youth, LGBT individuals, Native Americans, veterans, and survivors of suicide attempts)
• US: Suicide Hotlines by State
• US: Peer Support "Warmlines" by State
• US and Canada: Text 741741 (US) / 686868 (Canada) (Crisis Text Line; also accepts messages through Facebook messenger at facebook.com/crisistextline; connects individuals to trained volunteers; LGBT friendly)
• UK and ROI: 116-123 (Samaritans; free to call; also accepts emails to jo@samaritans.org (UK) or jo@samaritans.ie (ROI); has a Welsh language line at 0808-164-0123 that's open evenings into the early morning; accepts youth)
• UK: 01708-765200 (SupportLine; also accepts emails to info@supportline.org.uk; for youth and adults, including survivors of abuse and individuals from marginalized communities)
• UK: 0300-304-7000 (SANEline; open from 4.30pm to 10.30pm; for anyone 16+ who is in crisis and affected by mental illness, including loved ones and caregivers; has a text service for requests for information or other non-crisis needs)
• Australia: 13 11 14 (Lifeline; available 24/7; available to d/Deaf, hard of hearing, or speech impaired individuals through the National Relay Service (TTY: 133 677; Speak and Listen: 1300 555 727); translation available through 131 450; online crisis chat also available from 7pm to midnight; trial text services also available at 0477 13 11 14 from 5pm to 9pm; accepts all ages, genders, sexualities, ethnicities, and religions)
• Australia: Mental Health Crisis Lines
• International: Befrienders Worldwide Hotlines 
• International: Hotlines by Country 
• International: Suicide Hotlines by Country 
• International: Online Crisis Chats
• International: Crisis Centers and Hotlines by Country and Online Resources 

Child Abuse and Youth Mental Health Hotlines

General

• US or Canada: 1-800-422-4453 (1-800-4-A-CHILD; Childhelp; provides assistance in 170 languages; offers crisis intervention, information, and referrals; cannot make reports of abuse, but will walk you through the report)
• US and Canada: 1-800-448-3000 (Your Life Your Voice / Boys Town; also accepts text messages at 20121 and has a hotline specifically for individuals who are d/Deaf or hard of hearing at 1-800-448-1833; translation services in over 100 languages; has a contact form and allows chat and email; for pre-teens, teens, and young adults who need help as well as for their parents; provides support or help for a multitude of problems)
• UK: 0808-800-5000 (NSPCC Childline; also allows contact through email or through SignVideo for individuals who are d/Deaf or hard of hearing; associated with additional dedicated hotlines)
• UK: 0800-1111 (Childline for those under 19; also allows email, 1 on 1 chat, and SignVideo; provides support or help for a multitude of problems)
• Australia: AIFS lists numbers for specific reporting lines for different states
• Other international helplines: Child Helpline International lists local helplines in 139 different countries

Sexual Abuse

• US: 1-888-773-8368 (1-888-PREVENT; Stop It Now; also allows email contact and online chat and has an online help center; also helps those at risk of hurting children; however, only corresponds with adults over 18)
• US: 800-656-4673 (800-656-HOPE; RAINN; also has a 1 on 1 chat; for all survivors of sexual violence)
• UK and Ireland: 0808 1000 900 (Stop It Now; also allows email contact; also helps those at risk of hurting children and adult survivors of abuse; however, only corresponds with adults over 18)

Online Sexual Abuse and Child Sexual Abuse Material (Child Pornography)

• US: 1-800-843-5678 (1-800-THE-LOST; Cybertipline; accepts reports of "online enticement of children for sexual acts, extra-familial child sexual molestation, child pornography, child sex tourism, child sex trafficking, [and] unsolicited obscene materials sent to a child")
  
• International: Report Here (International Association of Internet Hotlines; allows reports of child sexual abuse material and child grooming)

Other Ways to Report Human Trafficking and Child Exploitation

• US: 1-888-373-7888 (National Human Trafficking Hotline; accepts tips in over 200 languages through interpreters; also allows tips to be submitted through an online form; also helps victims and survivors find social and legal services)
• US: 866-347-2423 (Homeland Security Investigations; also allows online form submission; accepts reports of child sexual exploitation and human trafficking)
• International: Hotlines by Country

Other

• US: State Child Abuse and Neglect Reporting Numbers
• US: Toll-Free Crisis Hotline Numbers 

Sexual Violence and Abuse Survivor Hotlines

Sexual Violence: General

• US: 800-656-4673 (800-656-HOPE; RAINN; also has a 1 on 1 chat; for all survivors of sexual violence)
• US: 800.787.3224 (TTY) or 800.799.7233 (Voice) or 855.812.1001 (VP) (Deaf Hope; Deaf advocates are available from 9am to 5pm (PST) Monday through Friday and hearing advocates 24/7; also available through AIM at DeafHotline and email at nationaldeafhotline@adwas.org; for d/Deaf survivors of domestic or sexual violence and their children)
• US: List of Hotlines and Crisis Centers by State 
• UK: 0808-801-0818 (Survivors Trust; available Monday through Thursday from 10am to 4pm and 6pm to 8pm and on Friday from 10am to 4pm; for all survivors of sexual violence; has a list of national hotlines here)
• UK: Safeline (male survivor hotline at 0808-800-5005 and young people's hotline at 0808-800-5007 (no longer has a female survivor hotline due to being overwhelmed by calls); text services at 07860-027573; also accepts emails to support@safeline.org.uk; services available to all survivors regardless of sexuality, gender, or race as well as to family members and friends of survivors)
• Australia: 1-800-737-732 (1-800-RESPECT; Respect; can also text 0458 737 732, chat online, or video call; national domestic, family and sexual violence counselling, information and support service)

Sexual Violence: Women and Girls Only

• UK: 0808-802-9999 (Rape Crisis England & Wales; available from 12pm to 2:30pm and from 7pm to 9:30pm; for female survivors of sexual violence; has a page for finding local rape crisis centers and hotlines, including those that also accept men and boys)
• International: List of women's helplines in European countries

Sexual Violence: Men Only

• US: 1in6 (online chat with a trained advocate for adult males who experienced sexual violence and their supporters)
• UK: SMS chat at 020-3322-1860 or Whatsapp chat at 074-9181-6064 (SurvivorsUK; also accepts emails to info@survivorsuk.org; has a chat service available Monday through Friday from 10:30am to 9pm and Saturdays and Sundays from 10am to 6pm; for men who experienced sexual abuse or assault as a child or adult or for close friends and family of male survivors; GBT friendly)
• Australia (Queensland): (07) 3435 4358 (Living Well; for male survivors of sexual violence and their loved ones; supports a diverse group of survivors; provides email counseling; also has an app)

Adult Abuse Survivors

• UK: 0808-801-0331 (NAPAC; available Monday through Thursday from 10am to 9pm and on Friday from 10am to 6pm; provides a supportive listening environment and information about the aftermath of abuse for survivor calls of up to 30 minutes; also responds to emails through a contact form; for adult survivors of child abuse and for their loved ones)
• Australia: 1-300-657-380 (Blue Knot; provides support to adult survivors of abuse and their supporters)

Domestic Violence Hotlines

General

• US: 1-800-799-7233 (1-800-799-SAFE; National Domestic Violence Hotline; provides assistance in over 200 languages; also allows chat; for friends and family, victims, survivors, and those who are concerned that they may be abusive; also supports d/Deaf, deaf-blind, and hard of hearing communities through TTY, video phone, instant messaging, or email)
• US: 1-866-331-9474 (Love is Respect; has a TTY for d/Deaf or hard of hearing individuals at 1-866-331-8453; has an online peer advocate chat; text loveis to 22522 for text based support; aimed primarily at young people in dating violence situations and their supporters; supports LGBT individuals and undocumented immigrants)
• US: 800.787.3224 (TTY) or 800.799.7233 (Voice) or 855.812.1001 (VP) (Deaf Hope; Deaf advocates are available from 9am to 5pm (PST) Monday through Friday and hearing advocates 24/7; also available through AIM at DeafHotline and email at nationaldeafhotline@adwas.org; for d/Deaf survivors of domestic or sexual violence and their children)
• Australia (New South Wales): 1300 1300 52 (Parent Line; available from 9am to 9pm Monday to Friday and 4pm to 9pm on weekends; translation available through 131 450; for caregivers who are concerned about the impact of domestic violence or other serious issues on children under age 18; also provides information about suspicions of child maltreatment)
• Australia: 1-800-737-732 (1-800-RESPECT; Respect; can also text 0458 737 732, chat online, or video call; national domestic, family and sexual violence counselling, information and support service)
  
• International: Domestic Violence Resources by Country

Women and Children Only

• Canada (Ontario): 1-866-863-0511 or 1-866-863-7868 (TTY) (Assaulted Women's Helpline; available 24/7; services in French at 1.877.336.2433 or 1.866.860.7082 (ATS); also available through text at #SAFE (#7233); accepts disabled, immigrant, ethnic minority, and LGBT women)
• UK: 0808-2000-247 (Refuge and Women's Aid; for women and children experiencing domestic violence and their loved ones; can provide translators, including for those who are d/Deaf or hard of hearing; also accepts emails to helpline@womensaid.org.uk)

Men Only

• UK: 0808-801-0327 (Men's Advice Line; available 9am-5pm, Monday to Friday; also accepts emails to info@mensadviceline.org.uk; has a chat service available Tuesdays and Thursdays from 10am to 4pm; for men experiencing abuse from a partner, ex-partner, or family; available for straight, gay, and bi men as well as frontline workers; has additional resources for male victims here)
• UK: 01823 334244 (ManKind; available weekdays from 10am to 4pm; for men who experienced or are experiencing domestic violence, including those in same sex relationships, and for their loved ones)
• Ireland: 046 9023718 (Men's Aid Ireland; available Monday to Friday from 9am to 5pm; for men who experienced or are experiencing domestic violence; also provides counseling, legal advice, and parenting courses)
• Australia: 1300 78 99 78 (MensLine; available 24/7; also has online chat and video counseling; also provides mental health and relationship support for men)

Individuals Concerned About Hurting Their Partner

• UK: 0808-802-4040 (Respect; available 9am-5pm Monday to Friday; also accepts emails to info@respectphoneline.org.uk; has a chat service available Tuesdays and Thursdays from 10am to 4pm; for individuals of all genders and sexualities who are concerned that they may be violent or abusive)

Other Resource Hotlines

• US: 1-800-950-6264 (1-800-950-NAMI; NAMI; available Monday through Friday from 10am to 6pm; also accepts emails to info@nami.org; for questions about mental health issues and resources; can help an individual to locate local crisis services)
• US: Healthy Place provides a list of hotlines pertaining to mental health, addiction, and trauma
• US and Canada: 211 (2-1-1; available 24/7 in multiple languages; connects individuals to local resources, including crisis resources, mental health and addiction resources, and support for trauma survivors)
• Canada: Dawn Canada provides a list of crisis hotlines and services pertaining to mental health or domestic or sexual violence
• Canada: Canadian Mental Health Association provides a list of hotlines and services pertaining to mental health, addiction, and trauma, including specific services for racial and religious minorities, LGBT individuals, youth, older adults, supporters, and individuals in need
• UK: 0300-123-3393 (MIND; available Monday through Friday from 9am to 6pm; accepts texts at 86463, emails at info@mind.org.uk, or messages through an online chat service; provides information on mental health problems, resources, and advocacy)
• UK and ROI: Hotlines and Other Resources by Theme and Country 
• Australia: Shire of Serpentine Jarrahdale provides a list of hotlines pertaining to mental health, domestic or sexual violence, and concerns about a child's well being
• US, UK, and Australia: BPD World provides a list of hotlines pertaining to mental health, addiction, and trauma
• International: World Helplines provides a list of hotlines pertaining to mental health, addiction, and trauma, including hotlines for LGBT individuals and youth